Large File Copies May Fail After 4 Gigabytes in Windows NT
Article ID: 104181
Article Last Modified on 3/15/2004
APPLIES TO
- Microsoft Windows NT Advanced Server 3.1
- Microsoft Windows NT Workstation 3.1
- Microsoft Windows NT Advanced Server 3.1
This article was previously published under Q104181
SYMPTOMS
When you copy a large file [greater than 4 gigabytes (GB) in size]
between two Windows NT computers, the file may become corrupted on the
destination computer.
CAUSE
This is caused by a problem with the Windows NT network redirector
where, in extending the file after copying just less than 4 GB, the
redirector actually truncates the file by using only the low part of
the LARGE_INTEGER file size. The next write then time-outs because the
server has to zero-extend the file, which takes more than 45 seconds.
NOTE: Even if the time-out didn't occur, all of the data between the
truncation point and 4 GB would be lost, which would be even worse.
STATUS
Microsoft has confirmed this to be a problem in Windows NT and Windows NT
Advanced Server version 3.1. This problem was corrected in the latest U.S.
Service Pack for Windows NT and Windows NT Advanced Server version 3.1. For
information on obtaining the Service Pack, query on the following word in
the Microsoft Knowledge Base:
Additional query words: prodnt
Keywords: kbnetwork KB104181