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SCSI Pass-Through Direct: Wikis

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SPTD
Developer(s) Duplex Secure, Ltd.
Stable release 1.62 / October 16, 2009
Operating system Windows 2000 to Windows 7
License Proprietary
Website www.duplexsecure.com

SCSI Pass Through Direct (usually abbreviated as SPTD, filename "sptd.sys") is a device driver developed by Duplex Secure Ltd. that provides a new method of access to storage devices. The SPTD API is not open to the public.

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Implementations

SPTD is used by Daemon Tools and Alcohol 120%. It is also utilized in PowerArchiver Pro 2010 (v11.60+); however, a configurable option is available to disable it.[1] It is known to be incompatible with kernel-mode debugging including WinDbg and Microsoft's other command line debuggers as well as SoftICE. Further, certain versions of the open-source optical media burning software ImgBurn will issue a warning, "SPTD can have a detrimental effect on drive performance", if the application detects that SPTD is active/installed.

In the PowerArchiver Blog (see footnote above) of September 10, 2009, ConeXware (the maker of PowerArchiver) claims that in their internal testing SPTD improved optical drive burn rates by up to 20 percent versus "old school" SPTI.

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