DOCUMENT:Q259573 29-OCT-2000 [winnt] TITLE :BUG: SCSI Pass Through Fails with Invalid User Buffer Error PRODUCT :Microsoft Windows NT PROD/VER:WINDOWS:; winnt: OPER/SYS: KEYWORDS:kbDDK kbOSWin2000bug kbStorageDev kbDSupport kbGrpDSNTDDK ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Server - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Driver Development Kit (DDK) ------------------------------------------------------------------------------- SYMPTOMS ======== When you use IOCTL_SCSI_PASS_THROUGH or IOCTL_SCSI_PASS_THROUGH_DIRECT, with the DataTransferLength member of the SCSI_PASS_THROUGH structure set to 1, the call fails with the following error message: Error: 1784 The supplied user buffer is not valid for the requested operation. CAUSE ===== The Scsiport.sys driver checks the validity of the user buffer that is sent by the application. This test fails if the value of DataTransferLength is set to 1, and therefore the ScsiPort driver fails this call. RESOLUTION ========== As a temporary workaround, set DataTransferLength to a value other than 1. STATUS ====== Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. MORE INFORMATION ================ This call fails only in Windows 2000. REFERENCES ========== See the Windows 2000 DDK documentation. Additional query words: IOCTL_SCSI_PASS_THROUGH SCSI passthrough ====================================================================== Keywords : kbDDK kbOSWin2000bug kbStorageDev kbDSupport kbGrpDSNTDDK Component : DDK Drivers,IDE Drivers,SCSI Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbwin2000DDK kbAudDeveloper kbWinDDKSearch kbWinAdvServSearch Version : WINDOWS:; winnt: Issue type : kbbug Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.