Overlapped I/O to Tape Results In Data Corruption (150302)
The information in this article applies to:
- Microsoft Windows NT Workstation 3.51
- Microsoft Windows NT Server 3.51
This article was previously published under Q150302 SYMPTOMS
Data corruption occurs when you write data to the Windows NT 3.51 tape
drivers using overlapped I/O. The Windows NT backup program NTBackup.exe
does not support overlapped I/O, so this problem only affects developers
writing third-party backup software for Windows NT.
CAUSE
The data corruption occurs because the tape drivers do not zero out the
QueueSortKey in the SCSI Request Block (SRB) before submitting the SRB to
the SCSIPort driver. As a result, random values are placed in the
QueueSortKey, causing overlapped writes to be committed to tape out of
order.
RESOLUTION
Change the tape drivers to set the QueueSortKey to zero before submitting
write requests to the SCSIPort driver.
STATUS
Microsoft has confirmed this to be a problem in <product and version>.
This problem was corrected in the latest Windows NT 3.51 U.S. Service
Pack. For information on obtaining the Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):
| Modification Type: | Major | Last Reviewed: | 10/28/2003 |
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| Keywords: | KB150302 |
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