Microsoft KB Archive/153264

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SCSI Miniport AlignmentMask Restrictions

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Q153264

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The information in this article applies to:


 * Microsoft Win32 Device Driver Kit (DDK) for Windows NT, versions 3.5, 3.51

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SUMMARY
SCSI miniport drivers indicate the alignment restrictions of scatter/gather buffer pointers in the AlignmentMask field of the PORT_CONFIGURATION_INFORMATION structure. The maximum alignment supported by Windows NT is 0x7. This setting yields cache-aligned buffers.

In theory, a larger AlignmentMask could be specified by the SCSI miniport, but the file systems layered above the driver cannot honor the alignment request, so they will eventually fail.

MORE INFORMATION
Refer to the Windows NT Device Driver Kit documentation for details on SCSI miniport design.

Additional query words: 3.50

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Issue type :

Technology : kbAudDeveloper kbWinDDKSearch kbWin32sSearch kbWin32DDKSearch kbWin32DDKNT350 kbWin32DDKNT351 kbWin32DDKNTSearch