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From Wikipedia, the free encyclopedia

A Laptop is a personal computer designed for mobile use and small and light enough to sit on a person's lap while in use.[1] A laptop integrates most of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, and/or a pointing stick), speakers, and often including a battery, into a single small and light unit. The rechargeable battery (if present) is charged from an AC adapter and typically stores enough energy to run the laptop for two to three hours in its initial state, depending on the configuration and power management of the computer.

Laptops are usually notebook-shaped with thicknesses between 0.7–1.5 inches (18–38 mm) and dimensions ranging from 10x8 inches (27x22cm, 13" display) to 15x11 inches (39x28cm, 17" display) and up. Modern laptops weigh 3 to 12 pounds (1.4 to 5.4 kg); older laptops were usually heavier. Most laptops are designed in the flip form factor to protect the screen and the keyboard when closed. Modern tablet laptops have a complex joint between the keyboard housing and the display, permitting the display panel to swivel and then lie flat on the keyboard housing.

Laptops were originally considered to be "a small niche market" and were thought suitable mostly for "specialized field applications" such as "the military, the Internal Revenue Service, accountants and sales representatives". But today, there are already more laptops than desktops in businesses, and laptops are becoming obligatory for student use and more popular for general use. In 2008 more laptops than desktops were sold in the US and it has been predicted that the same milestone will be reached in the worldwide market as soon as late 2009[citation needed].



As the personal computer became feasible in the early 1970s, the idea of a portable personal computer followed. A "personal, portable information manipulator" was imagined by Alan Kay at Xerox PARC in 1968[2] and described in his 1972 paper as the "Dynabook".[3]

The IBM SCAMP project (Special Computer APL Machine Portable), was demonstrated in 1973. This prototype was based on the PALM processor (Put All Logic In Microcode).

The IBM 5100, the first commercially available portable computer, appeared in September 1975, and was based on the SCAMP prototype.[4]

As 8-bit CPU machines became widely accepted, the number of portables increased rapidly. The Osborne 1, released in 1981, used the Zilog Z80 and weighed 23.5 pounds (10.7 kg). It had no battery, a 5" CRT screen and dual 5¼" single-density floppy drives. In the same year the first laptop-sized portable computer, the Epson HX-20, was announced.[5] The Epson had a LCD screen, a rechargeable battery and a calculator-size printer in a 1.6 kg (3.5 lb) chassis. Both Tandy/RadioShack and HP also produced portable computers of varying designs during this period.[6][7]

The first laptops using the flip form factor appeared in the early 1980s. The Dulmont Magnum was released in Australia in 1981-2, but was not marketed internationally until 1984-5. The 8150 US$ GRiD Compass 1100, released in 1982, was used at NASA and by the military among others. The Gavilan SC, released in 1983, was the first notebook marketed using the term "laptop".[8] From 1983 onwards, several new input techniques were developed and included in laptops, including the touchpad (Gavilan SC, 1983), the pointing stick (IBM ThinkPad 700, 1992) and handwriting recognition (Linus Write-Top,[9] 1987). Some CPUs were designed specifically for low power use including laptops (Intel i386SL, 1990), and were supported by dynamic power management features (Intel SpeedStep and AMD PowerNow!) in some designs. Displays reached VGA resolution by 1988 (Compaq SLT/286) and 256-color screens by 1993 (PowerBook 165c), progressing quickly to millions of colors and high resolutions. High-capacity hard drives and optical storage (CD-ROM followed by CD-R and CD-RW and eventually by DVD-ROM and the writable varieties) became available in laptops soon after their introduction to the desktops.


The general terms "laptop" or "notebook" can be used to refer to a number of classes of small portable computers:[10][11]

By purpose and (approximately) by screen size:

  • Desktop replacement – emphasizes performance, is less portable, 15" and larger screen;
  • Standard laptop – balances portability and features, 13-15" screen;
  • Subnotebook – emphasizes portability, has fewer features, 12" or smaller screen.

By features:

  • Budget – a cheap, lower-performance standard-sized laptop;
  • Tablet PC – Has a touch-screen interface, may or may not have a keyboard;
  • Netbook – A budget subnotebook suited to Internet surfing and basic office applications. Usually has a 9" or 10" screen.
  • Gaming laptop - A larger laptop with a powerful graphics card for playing graphics-intensive computer games.
  • Rugged – Engineered to operate in tough conditions (strong vibrations, extreme temperatures, wet and dusty environments).

Desktop replacement

Dell XPS M140 Laptop.

A desktop replacement computer is a laptop that provides most of the capabilities of a desktop computer, with a similar level of performance. Desktop replacements are usually larger and heavier than standard laptops. They contain more powerful components and have a 15" or larger display.[11] Because of their bulk, they are not as portable as other laptops and their operation time on batteries is typically shorter; instead, they are meant to be used as a more compact, easier to carry alternative to a desktop computer.[11]

Some laptops in this class use a limited range of desktop components to provide better performance for the same price at the expense of battery life; in a few of those models, there is no battery at all and the laptop can only be used when plugged in. These are sometimes called desknotes, a portmanteau of the words "desktop" and "notebook," though the term can also be applied to desktop replacement computers in general.[12]

In the early 2000s, desktops were more powerful, easier to upgrade, and much cheaper in comparison with laptops. But in the last few years, the advantages have drastically changed or shrunk since the performance of laptops has markedly increased.[13] In the second half of 2008, laptops have finally outsold desktops for the first time ever. In the U.S., the PC shipment declined 10 percent in the fourth quarter of 2008. In Asia, the worst PC shipment growth went up 1.8 percent over the same quarter the previous year since PC statistics research started.[14]

The names "Media Center Laptops" and "Gaming Laptops" are also used to describe specialized members of this class of notebooks.[10]


Sony VAIO P series subnotebook.

A subnotebook, also called an ultraportable by some vendors, is a laptop designed and marketed with an emphasis on portability (small size, low weight and longer battery life) that retains the performance of a standard notebook.[15] Subnotebooks are usually smaller and lighter than standard laptops, weighing between 0.8 and 2 kg (2 to 5 pounds);[10] the battery life can exceed 10 hours[16] when a large battery or an additional battery pack is installed.

To achieve the size and weight reductions, ultraportables use high resolution 13" and smaller screens (down to 6.4"), have relatively few ports, employ expensive components designed for minimal size and best power efficiency, and utilize advanced materials and construction methods. Some subnotebooks achieve a further portability improvement by omitting an optical/removable media drive; in this case they may be paired with a docking station that contains the drive and optionally more ports or an additional battery.

The term "subnotebook" is usually reserved to laptops that run general-purpose desktop operating systems such as Windows, Linux or Mac OS X, rather than specialized software such as Windows CE, Palm OS or Internet Tablet OS.


Netbooks are laptops that are light-weight, economical, energy-efficient and especially suited for wireless communication and Internet access.[17][18] Hence the name netbook (as "the device excels in web-based computing performance")[19] rather than notebook which pertains to size.[20]

With primary focus given to web browsing and e-mailing, netbooks "rely heavily on the Internet for remote access to web-based applications"[19] and are targeted increasingly at cloud computing users who rely on servers and require a less powerful client computer.[21] While the devices range in size from below 5 inches[22] to over 12,[23] most are between 7 and 11 inches and weigh between 0.9 - 1.4 kg (2-3 pounds).[19]

Netbooks normally use light-weight operating systems such Linux and Windows XP.

Because they're very portable, Netbooks have a few disadvantages. Because the netbooks are thin, the first such products introduced to the market had their primary internal storage in the form of solid-state drives and not hard disks, which are essential to installing very many programs. Hard disk drive technology and form factors have since been adapted to fit into netbooks.

Given their size and use of more rudimentary components compared to notebooks and subnotebooks, netbooks also generally have a smaller-capacity hard drive, slower CPU, and a lower-profile RAM capacity.[24]

Recently, Google has announced to be developing an own operating system called Chrome for this market.

The big breakthrough for netbook computers did not happen until the weight, diagonal form-factor and price combination of < 1 kg, < 9", < U.S. $400, respectively, became commercially available at around 2008.

Rugged laptop

A rugged (or ruggedized) laptop is designed to reliably operate in harsh usage conditions such as strong vibrations, extreme temperatures, and wet or dusty environments. Rugged laptops are usually designed from scratch, rather than adapted from regular consumer laptop models. Rugged notebooks are bulkier, heavier, and much more expensive than regular laptops,[25] and thus are seldom seen in regular consumer use.

The design features found in rugged laptops include rubber sheeting under the keyboard keys, sealed port and connector covers, passive cooling, superbright displays easily readable in daylight, cases and frames made of magnesium alloys[26] that are much stronger than plastic found in commercial laptops, and solid-state storage devices or hard disc drives that are shock mounted to withstand constant vibrations. Rugged laptops are commonly used by public safety services (police, fire and medical emergency), military, utilities, field service technicians, construction, mining and oil drilling personnel. Rugged laptops are usually sold to organizations, rather than individuals, and are rarely marketed via retail channels.


Miniaturization: a comparison of a desktop computer motherboard (ATX form factor) to a motherboard from a 13" laptop (2008 unibody Macbook)
Inner view of a Sony Vaio laptop

The basic components of laptops are similar in function to their desktop counterparts, but are miniaturized, adapted to mobile use, and designed for low power consumption. Because of the additional requirements, laptop components are usually of inferior performance compared to similarly priced desktop parts. Furthermore, the design bounds on power, size, and cooling of laptops limit the maximum performance of laptop parts compared to that of desktop components.[27]

The following list summarizes the differences and distinguishing features of laptop components in comparison to desktop personal computer parts:

  • Motherboard – Laptop motherboards are highly make and model specific, and do not conform to a desktop form factor. Unlike a desktop board that usually has several slots for expansion cards (3 to 7 are common), a board for a small, highly integrated laptop may have no expansion slots at all, with all the functionality implemented on the motherboard itself; the only expansion possible in this case is via an external port such as USB. Other boards may have one or more standard, such as ExpressCard, or proprietary expansion slots. Several other functions (storage controllers, networking, sound card and external ports) are implemented on the motherboard.[28]
A SODIMM memory module.
  • Memory (RAM)SO-DIMM memory modules that are usually found in laptops are about half the size of desktop DIMMs.[28] They may be accessible from the bottom of the laptop for ease of upgrading, or placed in locations not intended for user replacement such as between the keyboard and the motherboard. Currently, most midrange laptops are factory equipped with 3-4 GB of DDR2 RAM, while some higher end notebooks feature up to 8 GB of DDR3 memory. Netbooks however, are commonly equipped with only 1 GB of RAM to keep manufacturing costs low.
  • Expansion cards – A PC Card (formerly PCMCIA) or ExpressCard bay for expansion cards is often present on laptops to allow adding and removing functionality, even when the laptop is powered on. Some subsystems (such as Ethernet, Wi-Fi, or a cellular modem) can be implemented as replaceable internal expansion cards, usually accessible under an access cover on the bottom of the laptop. Two popular standards for such cards are MiniPCI and its successor, the PCI Express Mini.[31]
  • Power supply – Laptops are typically powered by an internal rechargeable battery that is charged using an external power supply. The power supply can charge the battery and power the laptop simultaneously; when the battery is fully charged, the laptop continues to run on AC power. The charger adds about 400 grams (1 lb) to the overall "transport weight" of the notebook.
  • Battery – Current laptops utilize lithium ion batteries, with more recent models using the new lithium polymer technology. These two technologies have largely replaced the older nickel metal-hydride batteries. Typical battery life for standard laptops is two to five hours of light-duty use, but may drop to as little as one hour when doing power-intensive tasks. A battery's performance gradually decreases with time, leading to an eventual replacement in one to three years, depending on the charging and discharging pattern. This large-capacity main battery should not be confused with the much smaller battery nearly all computers use to run the real-time clock and to store the BIOS configuration in the CMOS memory when the computer is off. Lithium-ion batteries do not have a memory effect as older batteries may have. The memory effect happens when one does not use a battery to its fullest extent, then recharges the battery. New innovations in laptops and batteries have seen new possible matchings which can provide up to a full 24 hours of continued operation, assuming average power consumption levels. An example of this is the HP EliteBook 6930p when used with its ultra-capacity battery.
  • Video display controller – On standard laptops the video controller is usually integrated into the chipset. This tends to limit the use of laptops for gaming and entertainment, two fields which have constantly escalating hardware demands.[32] Higher-end laptops and desktop replacements in particular often come with dedicated graphics processors on the motherboard or as an internal expansion card. These mobile graphics processors are comparable in performance to mainstream desktop graphic accelerator boards.[33]
  • Display – Most modern laptops feature 12 inches (30 cm) or larger color active matrix displays based on a CCFL lamp with resolutions of 1280x800 (16:10) or 1366 x 768 (16:9) pixels and above. Many current models use screens with higher resolution than typical for desktop PCs (for example, the 1440×900 resolution of a 15"). Newer laptops come with LED based screens offering a lesser power consumption and wider viewing angles. Macbook Pro[34] can be found on 19" widescreen desktop monitors.
A size comparison of 3.5" and 2.5" hard disk drives
  • Removable media drives – A DVD/CD reader/writer drive is typically standard. CD drives are becoming rare, while Blu-Ray is becoming more common on notebooks.[35] Many ultraportables and netbooks either move the removable media drive into the docking station or exclude it altogether.
  • Internal storage – Laptop hard disks are physically smaller—2.5 inches (64 mm) or 1.8 inches (46 mm) —compared to desktop 3.5 inches (89 mm) drives. Some newer laptops (usually ultraportables) employ more expensive, but faster, lighter and power-efficient flash memory-based SSDs instead. Currently, 250 to 500 GB sizes are common for laptop hard disks (64 to 256 GB for SSDs).
  • Input – A pointing stick, touchpad or both are used to control the position of the cursor on the screen, and an integrated keyboard is used for typing. An external keyboard and/or mouse may be connected using USB or PS/2 (if present).

Docking stations

A docking station is a relatively bulky laptop accessory that contains multiple ports, expansion slots, and bays for fixed or removable drives. A laptop connects and disconnects easily to a docking station, typically through a single large proprietary connector. A port replicator is a simplified docking station that only provides connections from the laptop to input/output ports. Both docking stations and port replicators are intended to be used at a permanent working place (a desk) to offer instant connection to multiple input/output devices and to extend a laptop's capabilities.

Docking stations became a common laptop accessory in the early 1990s. The most common use was in a corporate computing environment where the company had standardized on a common network card and this same card was placed into the docking station. These stations were very large and quite expensive. As the need for additional storage and expansion slots became less critical because of the high integration inside the laptop, port replicators have gained popularity, being a cheaper, often passive device that often simply mates to the connectors on the back of the notebook, or connects via a standardised port such as USB or FireWire.


Some laptop components (optical drives, hard drives, memory and internal expansion cards) are relatively standardized, and it is possible to upgrade or replace them in many laptops as long as the new part is of the same type.[31] Depending on the manufacturer and model, a laptop may range from having several standard, easily customizable and upgradeable parts to a proprietary design that cannot be reconfigured at all.

In general, components other than the four categories listed above are not intended to be replaceable, and thus rarely follow a standard. In particular, motherboards, locations of ports, and design and placement of internal components are usually make and model specific. Those parts are neither interchangeable with parts from other manufacturers nor upgradeable. If broken or damaged, they must be substituted with an exact replacement part. Those users uneducated in the relevant fields are those the most affected by incompatibilities, especially if they attempt to connect their laptops with incompatible hardware or power adapters.

Intel, Asus, Compal, Quanta and other laptop manufacturers have created the Common Building Block standard for laptop parts to address some of the inefficiencies caused by the lack of standards.


Laptop computers are portable and can be used in many locations. Shown here is former Mexican president Vicente Fox.

Portability is usually the first feature mentioned in any comparison of laptops versus desktop PCs.[36] Portability means that a laptop can be used in many places—not only at home and at the office, but also during commuting and flights, in coffee shops, in lecture halls and libraries, at clients' location or at a meeting room, etc. The portability feature offers several distinct advantages:

  • Getting more work done – Using a laptop in places where a desktop PC can't be used, and at times that would otherwise be wasted. For example, an office worker managing their e-mails during an hour-long commute by train, or a student doing his/her homework at the university coffee shop during a break between lectures.[37]
  • Immediacy – Carrying a laptop means having instant access to various information, personal and work files. Immediacy allows better collaboration between coworkers or students, as a laptop can be flipped open to present a problem or a solution anytime, anywhere.
  • Up-to-date information – If a person has more than one desktop PC, a problem of synchronization arises: changes made on one computer are not automatically propagated to the others. There are ways to resolve this problem, including physical transfer of updated files (using a USB flash memory stick or CDRs) or using synchronization software over the Internet. However, using a single laptop at both locations avoids the problem entirely, as the files exist in a single location and are always up-to-date.
  • Connectivity – A proliferation of Wi-Fi wireless networks and cellular broadband data services (HSDPA, EVDO and others) combined with a near-ubiquitous support by laptops[38] means that a laptop can have easy Internet and local network connectivity while remaining mobile. Wi-Fi networks and laptop programs are especially widespread at university campuses.[39]

Other advantages of laptops include:

  • Size – Laptops are smaller than standard PCs. This is beneficial when space is at a premium, for example in small apartments and student dorms. When not in use, a laptop can be closed and put away.
  • Ease of Access - Most laptops have doors on the underside that allow the user to access the memory, hard drive and other components, by simply flipping the laptop to access the doors. For desktops the user must usually access the backside of the computer, which is harder if it's in an area with little space.
  • Low power consumption – Laptops are several times more power-efficient than desktops. A typical laptop uses 20-90 W, compared to 100-800 W for desktops. This could be particularly beneficial for businesses (which run hundreds of personal computers, multiplying the potential savings) and homes where there is a computer running 24/7 (such as a home media server, print server, etc.)
  • Quiet – Laptops are often quieter than desktops, due both to the components (quieter, slower 2.5-inch hard drives) and to less heat production leading to use of fewer and slower cooling fans.
  • Battery – a charged laptop can run several hours in case of a power outage and is not affected by short power interruptions and blackouts. A desktop PC needs a UPS to handle short interruptions, blackouts and spikes; achieving on-battery time of more than 20–30 minutes for a desktop PC requires a large and expensive UPS.[40]
  • All-in-One - designed to be portable, laptops have everything integrated in to the chassis. For desktops (excluding all-in-ones) this is divided into the desktop, keyboard, mouse, display, and optional peripherals such as speakers, and a webcam. This leads to lots of wiring. It can also lead to massive power consumption.
  • Extras - in comparison to low-end desktops, even low-end laptops include features such as integrated Wi-Fi, and Express Card slot, and a memory card reader.


Compared to desktop PCs, laptops have disadvantages in the following fields:


Whilst the performance of mainstream desktops and laptops is comparable, laptops are significantly more expensive than desktop PCs at the same or even lower performance level.[41] The upper limits of performance of laptops are a little bit lower, and "bleeding-edge" features usually appear first in desktops and only then, as the underlying technology matures, are adapted to laptops.

However, for Internet browsing and typical office applications, where the computer spends the majority of its time waiting for the next user input, even netbook-class laptops are generally fast enough.[42] Most higher-end laptops are sufficiently powerful for high-resolution movie playback, 3D gaming and video editing and encoding. However, laptops are disadvantaged when dealing with database, math, engineering, financial software, etc.

Some manufacturers work around this performance problem by using desktop CPUs for laptops.[43]


Upgradeability of laptops is very limited compared to desktops, which are thoroughly standardized. In general, hard drives and memory can be upgraded easily. Optical drives and internal expansion cards may be upgraded if they follow an industry standard, but all other internal components, including the CPU, motherboard and graphics, are not intended to be upgradeable.

The reasons for limited upgradeability are both technical and economic. There is no industry-wide standard form factor for laptops; each major laptop manufacturer pursues its own proprietary design and construction, with the result that laptops are difficult to upgrade and have high repair costs. With few exceptions, laptop components can rarely be swapped between laptops of competing manufacturers, or even between laptops from the different product-lines of the same manufacturer.

Some upgrades can be performed by adding external devices, either USB or in expansion card format such a PC Card: sound cards, network adapters, hard and optical drives, and numerous other peripherals are available, but these upgrades usually impair the laptop's portability, because they add cables and boxes to the setup and often have to be disconnected and reconnected when the laptop is moved.

Ergonomics and health

Laptop coaster preventing heating of lap and improving laptop airflow.

Because of their small and flat keyboard and trackpad pointing devices, prolonged use of laptops can cause repetitive strain injury.[44] Usage of separate, external ergonomic keyboards and pointing devices is recommended to prevent injury when working for long periods of time; they can be connected to a laptop easily by USB or via a docking station. Some health standards require ergonomic keyboards at workplaces.

The integrated screen often causes users to hunch over for a better view, which can cause neck or spinal injuries. A larger and higher-quality external screen can be connected to almost any laptop to alleviate that and to provide additional "screen estate" for more productive work.

A study by State University of New York researchers found that heat generated from laptops can raise the temperature of the scrotum when balancing the computer on one's lap, potentially putting sperm count at risk. The study, which included roughly two dozen men aged 21 to 35, found that the sitting position required to balance a laptop can raise scrotum temperature by as much as 2.1 °C (3.78 °F). Heat from the laptop itself can raise the temperature by another 0.7 °C (1.26 °F), bringing the potential total increase to 2.8 °C (5.04 °F). However, further research is needed to determine whether this directly affects sterility in men.[45]

A common practical solution to this problem is to place the laptop on a table or desk. Another solution is to obtain a cooling unit for the laptop, these units are usually USB powered and consist of a hard thin plastic case housing 1, 2 or 3 cooling fans (with the entire assembly designed to sit under the laptop in question) which results in the laptop remaining cool to the touch, and greatly reduces laptop heat buildup.

Heat from using a laptop on the lap can also cause skin discoloration on the thighs.[46]


A clogged heatsink on a 2.5 year old laptop.

Due to their portability, laptops are subject to more wear and physical damage than desktops. Components such as screen hinges, latches, power jacks and power cords deteriorate gradually due to ordinary use. A liquid spill onto the keyboard, a rather minor mishap with a desktop system, can damage the internals of a laptop and result in a costly repair. One study found that a laptop is 3 times more likely to break during the first year of use than a desktop.[47]

Original external components are expensive, and usually proprietary and non-interchangeble; other parts are inexpensive—a power jack can cost a few dollars—but their replacement may require extensive disassembly and reassembly of the laptop by a technician. Other inexpensive but fragile parts often cannot be purchased separate from larger more expensive components.[48] The repair costs of a failed motherboard or LCD panel may exceed the value of a used laptop.

Laptops rely on extremely compact cooling systems involving a fan and heat sink that can fail due to eventual clogging by accumulated airborne dust and debris. Most laptops do not have any sort of removable dust collection filter over the air intake for these cooling systems, resulting in a system that gradually runs hotter and louder as the years pass. Eventually the laptop starts to overheat even at idle load levels. This dust is usually stuck inside where casual cleaning and vacuuming cannot remove it. Instead, a complete disassembly is needed to clean the laptop.

Battery life of laptops is limited; the capacity drops with time, necessitating an eventual replacement after a few years. The battery is often easily replaceable, and one may replace it on purpose with a higher end model to achieve better battery life.


Being valuable, common and portable, laptops are prized targets for theft. The cost of the stolen business or personal data and of the resulting problems (identity theft, credit card fraud, breach of privacy laws) can be many times the value of the stolen laptop itself. Therefore, both physical protection of laptops and the safeguarding of data contained on them are of the highest importance.

Most laptops have a Kensington security slot which is used to tether the computer to a desk or other immovable object with a security cable and lock. In addition to this, modern operating systems and third-party software offer disk encryption functionality that renders the data on the laptop's hard drive unreadable without a key or a passphrase.

Some laptops also now have additional security elements added by the consumer, including eye recognition software and fingerprint scanning components.

Major brands and manufacturers

There is a multitude of laptop brands and manufacturers; several major brands, offering notebooks in various classes, are listed in the box to the right.

The major brands usually offer good service and support, including well-executed documentation and driver downloads that will remain available for many years after a particular laptop model is no longer produced. Capitalizing on service, support and brand image, laptops from major brands are more expensive than laptops by smaller brands and ODMs.

Some brands are specializing in a particular class of laptops, such as gaming laptops (Alienware), netbooks (EeePC) and laptops for children (OLPC).

Many brands, including the major ones, do not design and do not manufacture their laptops. Instead, a small number of Original Design Manufacturers (ODMs) design new models of laptops, and the brands choose the models to be included in their lineup. In 2006, 7 major ODMs manufactured 7 of every 10 laptops in the world, with the largest one (Quanta Computer) having 30% world market share.[49] Therefore, there often are identical models available both from a major label and from a low-profile ODM in-house brand.


Battery-powered portable computers had just 2% worldwide market share in 1986.[51] But today, laptops are becoming increasingly popular, both for business and personal use.[52] In 2008 it is estimated that 145.9 million notebooks were sold, and in 2009 the number will grow to 177.7 million.[53] The third quarter of 2008 was the first time when notebook PC shipments exceeded desktops, with 38.6 million units versus 38.5 million units.[52][54][55][56]

For Microsoft Windows systems, the average selling price (ASP) showed a decline in 2008/2009, possibly due to low-cost netbooks, drawing 689 US$ at U.S. retail in August 2008. In 2009, ASP had further fallen to 602 US$ by January and to 560 US$ in February. While Windows machines fell 129 US$ in these seven months, Mac laptop ASP declined just 12 US$ from 1524 US$ to 1512 US$.[57]

Since 2006, the world's top selling Laptop brand is HP, which now has 21.2% marketshare. [1]

See also


  1. ^ What is a laptop computer
  2. ^ John W. Maxwell (2006) (PDF). Tracing the Dynabook: A Study of Technocultural Transformations. Retrieved 2008-10-17. 
  3. ^ Alan C. Kay (1972) (PDF). A Personal Computer for Children of All Ages. Retrieved 2008-10-17. 
  4. ^ "IBM 5100 computer". Retrieved 2009-07-06. 
  5. ^ "Epson SX-20 Promotional Brochure" (PDF). Epson America, Inc.. 1987. Retrieved 2008-11-02. 
  6. ^ "Tandy/Radio Shack model 100 portable computer". Retrieved 2009-07-06. 
  7. ^ "Hewlett-Packard model 85". Retrieved 2009-07-06. 
  8. ^ "Gavilian SC computer". Retrieved 2009-07-07. 
  9. ^ "Linus Write-Top". Retrieved 2008-10-18. 
  10. ^ a b c "Types of Laptops: How Do You Compute". PC Magazine. Ziff Davis Publishing Holdings Inc.. 2006-09-18.,2817,2311016,00.asp. Retrieved 2008-11-07. 
  11. ^ a b c "Laptop Buying Guide". CBS Interactive Inc.. Retrieved 2008-11-07. 
  12. ^ "Desktop notebooks stake their claim". CBS Interactive Inc.. 2003-01-08. Retrieved 2008-11-07. 
  13. ^ "Desktop are Dying Slain by Laptops". 
  14. ^ "PC sales Slow in Asia Pacific". 
  15. ^ What is a Subnotebook?
  16. ^ "Breaking the Mold: New Lenovo ThinkPad laptop and Tablet PCs Defy Ultraportable Computing". Lenovo. 2008-09-23. Retrieved 2008-11-07. 
  17. ^ The Net Impact of Netbooks? It Depends on Who Uses Them for What
  18. ^ Bergevin, Paul (2008-03-03). "Thoughts on Netbooks". 
  19. ^ a b c (PDF) Netbook Trends and Solid-State Technology Forecast. p. 7. Retrieved 2009-01-28. 
  20. ^ What is a laptop computer?
  21. ^ Copeland, Michael (2008-10-16). "Disruptor: The 'netbook' revolution". CNNMoney/Fortune. Retrieved 2009-12-29. 
  22. ^ UMID Netbook Only 4.8″
  23. ^ WORLD FIRST review of Inspiron Mini 12: Dell’s super-slim netbook!
  24. ^ "Cheap PCs Weigh on Microsoft". Business Technologies (The Wall Street Journal). 2008-12-08. 
  25. ^ "Rugged Laptop: Choices, Pointers & Specs of Buying Rugged Laptops". Retrieved 2008-11-27. 
  26. ^ For an example, on a CPU-intensive task (video encoding), the fastest-performing mobile CPU as of early 2008 (Intel Core 2 Extreme X7800, 2.6 GHz) performed about 30% worse than the slowest-performing desktop CPU (AMD Sempron 64 3000+, at 1.6 GHz) in the surveyed selection. "Mobile CPU charts". Tom's Hardware. 2008.,493.html. Retrieved 2008-11-12.  "CPU charts Q1/2008". Tom's Hardware. 2008.,403.html. Retrieved 2008-11-12. 
  27. ^ a b Catherine Roseberry. "What Makes Laptops Work – The Laptop Motherboard". Retrieved 2008-11-15. 
  28. ^ "Laptop Buyer's Guide". 2008. Retrieved 2008-11-15. 
  29. ^ The socketed CPUs are perhaps for the manufacturer's convenience, rather than the end-user, as some manufacturers try new CPUs in last year's laptop models with an eye toward selling upgrades rather than new laptops.
  30. ^ a b Gabriel Torres (2004-11-25). "Innovations in Notebook Expansion". Hardware Secrets, LLC. Retrieved 2008-11-15. 
  31. ^ "Game Hardware". Retrieved 2008-05-10. 
  32. ^ Dustin Sklavos (2006-07-18). "Notebook Video Graphics Card Guide 2006". Retrieved 2008-11-15. 
  33. ^ "Macbook Pro – Technical Specifications". Apple Inc.. 2008. Retrieved 2008-11-12. 
  34. ^ Yen Ting Chen, Esther Lam (2008-04-02). "Acer: BD notebooks to account for 10% of shipments in 2008". Digitimes. Retrieved 2008-11-12. 
  35. ^ "Should I buy a laptop or desktop?". IT Division – University of Wisconsin. 2008-03-19. Retrieved 2008-11-27. 
  36. ^ "ECU Advantage: Why have a laptop?". ECU. Retrieved 2008-11-27. 
  37. ^ Almost all laptops contain a Wi-Fi interface; broadband cellular devices are available widely as extension cards and USB devices, and also as internal cards in select models.
  38. ^ Josh Fischman (2008-08-07). "Faster Wi-Fi Predicted for Colleges". The Chronicle of Higher Education. Retrieved 2008-11-27. 
  39. ^ A sample line of UPS devices and on-battery power: "Back-UPS RS". APC. Retrieved 2008-11-27. 
  40. ^ In a comparison between laptop and desktop of equal cost, the desktop's System Benchmark Score was twice that of the laptop. "What to Buy, a Notebook or Desktop PC?". Tom's Hardware. 2008-06-11.,1946-7.html. Retrieved 2008-11-28. 
  41. ^ For example, a review of the MSI Wind Netbook says that "The device is rarely sluggish in general use. It renders Web pages quickly, launches most applications without becoming too bogged down and generally doesn't feel like it's a budget laptop." Reid, Rory (2008-07-07). "MSI Wind Review". CNET Australia.,239035649,339289583,00.htm. Retrieved 2008-11-28. 
  42. ^
  43. ^ Martin, James A. (2000-06-09). "The Pain of Portable Computing". PC World.,17082/printable.html. Retrieved 2008-11-27. 
  44. ^ Sheynkin, Y.; Jung M; Yoo P;Schulsinger D; Komaroff E (2004-12-09). "Increase in scrotal temperature in laptop computer users". Human Reproduction (Epub) 20 (2): 452–5. doi:10.1093/humrep/deh616. PMID 15591087. 
  45. ^ Levinbook, WS.; Mallet J; Grant-Kels JM (October 2007). "Laptop computer—associated erythema ab igne.". Cutis (Quadrant HealthCom) 80 (4): 319–20. PMID 18038695. 
  46. ^ "Gartner: Notebook PCs still prone to hardware failure". IDG News Service / ITWorld. 2006-06-27. Retrieved 2008-11-27. 
  47. ^ For example, the video display cable and the backlight power cable that pass through the lid hinges to connect the motherboard to the screen will eventually break from repeated opening and closing of the lid. These tiny cables usually cannot be purchased separate from the entire LCD panel, with the price of hundreds of dollars.
  48. ^ "Identical Laptops, Different Prices: Don't Be Fooled by Branding". Info-Tech Research Group. 2006-10-10.{DF4272EE-FB5F-4F0A-9A06-192B1CFE2DB8}&SubCenter={0487C9B2-1A2D-42D2-829D-3A34B8BE02F8}. Retrieved 2008-11-27. 
  49. ^ Toshiba Satellite low cost/high performance (A300-1EZ even cheaper at 699€)
  50. ^ "Lap-top computers gain stature as power grows" (in en). Daily News of Los Angeles (CA). April 12, 1987. Retrieved 2001-01-01/2008. 
  51. ^ a b "The Falling Costs of Mobile Computing". Falling Costs of Mobile Computing Drive Corporate Adoption. Computer Economics, Inc.. December 2005. Retrieved 2001-01-01/2008. 
  52. ^ Analysis: Did Intel underestimate netbook success?, Accessed at 10 January 2009
  53. ^ Notebook PC Shipments Exceed Desktops for First Time in Q3,, accessed at 13 January 2009
  54. ^ Randall Stross (2008-04-18). "The PC Doesn’t Have to Be an Anchor". New York Times. Retrieved 2009-04-20. 
  55. ^ "Intel: laptop/desktop crossover coming sooner than expected". The Register, UK. Retrieved 2008-10-10. 
  56. ^ Netbooks Are Destroying the Laptop Market and Microsoft Needs to Act Now

Study guide

Up to date as of January 14, 2010

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Parts of some laptops

  • Screen
  • Memory
  • Keyboard
  • USB ports
  • Wifi
  • Battery
  • CPU
  • Motherboard
  • Storage


Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

See also laptop





Laptop m.

  1. laptop


Up to date as of February 01, 2010

From Wikia Gaming, your source for walkthroughs, games, guides, and more!

A laptop computer, or simply laptop (also notebook computer or notebook), is a small mobile computer, which usually weighs 2.2-18 pounds (1-6 kilograms), depending on size, materials, and other factors.

  • Most modern laptops feature 12 inch (304.8 mm) or larger active matrix displays with resolutions of 1024×768-pixels and above, and have a PC Card (formerly PCMCIA) or ExpressCard expansion bay for expansion cards. Internal hard disks are physically smaller –2.5 inch (63.5 mm)– compared to the standard desktop 3.5 inch (88.9 mm) drive, and usually have lower performance and power consumption. Video and sound chips are usually integrated. This tends to limit the use of laptops for gaming and entertainment, two fields which have constantly escalating hardware demands. However, higher end laptops can come with dedicated graphics processors, such as the Dell Inspiron E1505 and E1705, which can be bought with an ATI Mobility Radeon X1300 or similar. These mobile graphics processors tend to have less performance than their desktop counterparts, but this is because they have been optimized for lower power usage.
  • There is a wide range of laptop specific processors available from Intel (Pentium M, Celeron, Intel Core and Intel Core 2) and from AMD (Athlon, Turion 64, and Sempron) and also from VIA (C3 and C7-M). Motorola and IBM developed and manufactured the chips for the former PowerPC-based Apple laptops (iBook and PowerBook). Generally, laptop processors are less powerful than their desktop counterparts, due to the need to save energy and reduce heat dissipation. However, the PowerPC G3 and G4 processor generations were able to offer almost the same performance as their desktop versions, limited mostly by other factors, such as the system bus bandwidth; recently, though, with the introduction of the G5s, they have been far outstripped. At one point, the Pismo G3, at up to 500 MHz, was faster than the fastest desktop G3 (then the B&W G3), which ran at 450 MHz.

For a given price range (and manufacturing base), laptop computational power has traditionally trailed that of desktops. This is partly due to most laptops sharing RAM between the program memory and the graphics adapter. By virtue of their usage goals, laptops prioritize energy efficiency and compactness over absolute performance. Desktop computers and their modular components are built to fit much bigger standard enclosures, along with the expectation of AC line power. As such, energy efficiency and portability for desktops are secondary design goals compared to absolute performance.

For typical home (personal use) applications, where the computer spends the majority of its time sitting idle for the next user input, laptops of the thin-client type or larger are generally fast enough to achieve the required performance. 3D gaming, multimedia (video) encoding and playback, and analysis-packages (database, math, engineering, financial, etc.) are areas where desktops still offer the casual user a compelling advantage.

With the advent of dual-core processors and perpendicular recording, laptops are beginning to close the performance gap with PCs. Intel's Core 2 line of processors is efficient enough to be used in portable computers, and many manufacturers such as Apple Computer and Dell are building Core 2 based laptops. Also, many high end laptop computers feature mobility versions of graphics cards, eliminating the performance losses associated with integrated graphics.

This article uses material from the "Laptop" article on the Gaming wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.

Simple English

A laptop is a computer which is easy to carry around. Its user can fold the laptop up and be able to take it with him/her. The laptop was created mainly for this particular reason. In order to develop a laptop a computer technology was taken and then scaled to smaller size.


The first laptop was invented in 1969 by Bill Moggridge. The British developed his portable computer for GRiD Systems Corporation. GRiD made the product with a fold down display that covered the keyboard. GRiD started manufacturing in 1979 with commercial distribution occurring in 1981.

GRiD's computer was five times lighter than any other computer used at that time. NASA used the laptop when it performed its shuttle program back in 1980s. GRiD held patents for the Clamshell design which represents our modern laptop design. GRiD was acquired in 1988 by Tandy Corporation who after acquisition monetized the Clamshell Patent by aggressively pursuing all computer manufacturers who were selling clamshell design laptops. GRiD also had patents for handheld and handwriting computers which Tandy holds to this day.

Historians, however, consider that the first portable was created in 1981 and its name was Osborne 1. Its inventor was Adam Osborne who was also a former book publisher. He was the founder of Osborne Computer. His portable computer weighted 24 pounds.

The company spent 1,795 US dollars on creating the computer, which had a five inch screen and a special place for a modem and two devices for using a floppy disk. There were also several programs designed for the computer and a battery pack for providing energy. The computer, however, was not successful.

The same year saw the birth of another computer called Epson HX-20. It was a portable computer with a liquid crystal display (LCD) monitor. The computer also included a built-in printer. The whole device was battery powered.

One year later, in 1982, two computer designers from Microsoft, Kazuhiko Nishi and Bill Gates, started their discussion concerning a new portable computer. The main thing about the computer was a new LCD technology. The prototype of the new laptop was presented to Radio Shack.

The latter agreed to start the production of the computer. A year later the company launched its TRS-80 Model 100, which was a computer that looked pretty much like a laptop we know it today.

In 1986 the company created its improved version called TRS Model 200. The following two years saw the appearance of laptop PC from Compaq Computers and the first notebook style laptop from NEC called NEC UltraLite.

The year 1989 was quite successful for laptop producers. First there was Apple Computer that developed its first portable computer called Macintosh Portable the evolution of which turned it into Powerbook. Then the company named Zenith Data Systems introduced its Zenith MinisPort – a portable computer weighting 6 pounds. Finally there was Compaq Computer that designed its first laptop PC called Compaq LTE.

The development of laptops continued with various upgrades and additional functions added. Laptops have a lot of advantages like:

  • People can carry them anywhere, whether office or home.
  • The work area of a laptop is much smaller than an ordinary personal computer.

At the same time portable computers have several negative points like:

  • Computer thefts became easier.
  • While used in the car they can cause car accidents.
  • They break more easily than desktop computers.

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