Knowledge Base
Common Cause of "Error Performing Inpage Operation" ExplainedPSS ID Number:
141117
Article Last Modified on 5/7/2003
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The information in this article applies to:
Microsoft Windows NT Server 4.0 Terminal Server Edition
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Datacenter Server
Microsoft BackOffice Server 4.0
Microsoft Windows NT Server, Enterprise Edition 4.0
Microsoft Windows NT Server 3.1
Microsoft Windows NT Server 3.5
Microsoft Windows NT Server 3.51
Microsoft Windows NT Server 4.0
Microsoft Windows NT Workstation 3.1
Microsoft Windows NT Workstation 3.5
Microsoft Windows NT Workstation 3.51
Microsoft Windows NT Workstation 4.0
Microsoft Windows NT Advanced Server
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This article was previously published under Q141117
SUMMARY
When copying files from a diskette on a Windows computer, you may
occasionally experience an "Error performing inpage operation".
In this scenario, this error usually indicates physical problems on the
diskette media, and is probably unrelated to paging operations involving the
Windows paging file, despite the wording of the error message.
MORE INFORMATION
Copy utilities commonly use the CopyFile() Win32 API to copy files.
For small files (where small is arbitrarily defined in the Windows source
code as less than 256 kilobytes) the Windows CopyFile() API does not
actually open the source file and read from it using the CreateFile() and
ReadFile() APIs as might be expected.
Instead, the CopyFile() API creates a File Mapping and maps the file into
virtual memory. Data is then read from the file by simply accessing this
memory. As the memory is accessed, the required portions of the file are
paged into memory on demand. This leverages the paging functionality of the
Windows Virtual Memory Manager, but introduces the jargon of Paging into
this particular file copy scenario.
Consequently, if I/O errors occur while processing a CopyFile() API for a
"small" file, they will not be reported as File I/O Errors. Instead, as
these errors are detected in what is effectively a paging operation (albeit
unrelated to the Windows paging file), they will be reported as "Error
performing inpage operation".
Additionally, errors caused by network connectivity can cause these errors.
Mismatched MTU sizes or truncation of a packet at a router can result in
this error when files larger than the largest packet size are copied over
the network. In essence, the network connection is the media that has the
physical problem.
REFERENCES
For more information on memory-mapped files, refer to the following:
Helen Custer's "Inside Windows NT", Section 6.2.1, "Sharing Memory".
The Win32 Programmer's Reference, Volume 2, Chapter 47, "File Mapping".
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Knowledge Base
Windows NT 4.0 Not Able to Read Some Compact DiscsPSS ID Number: 142687
Article Last Modified on 8/8/2001
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The information in this article applies to:
Microsoft Windows NT Workstation 4.0
Microsoft Windows NT Server 4.0
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This article was previously published under Q142687
SYMPTOMS
When you attempt to read or copy files from certain compact discs to your
hard drive, you get the following error message:
Cannot copy <filename>: Error performing inpage operation.
The same files could be copied by earlier versions of Windows NT, or by
other operating systems, and other compact discs work correctly.
CAUSE
This error is caused by the compact disc file system (CDFS) not quite
correctly recognizing the allocation size of a file on media of a block size
different than the physical sector size of 2048 on a compact disc (for
example, less than indicated per ISO 9660). CDFS tries to generate sector-
aligned reads regardless of whether it is doing that reading beyond the
mapped range of the file.
RESOLUTION
The fixed version of CDFS.sys is available in Windows NT 4.0 Service Pack 2
or later.
STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.00.
This problem was corrected in the latest Microsoft Windows NT 4.0 U.S.
Service Pack. For information on obtaining the service pack, query on the
following word in the Microsoft Knowledge Base: SERVPACK
--
Randy Birch
MVP Visual Basic
http://www.mvps.org/vbnet/
Please respond only to the newsgroups so all can benefit.
"B Golash" <golash1(REMOVE)@verizon.net> wrote in message
news:Un***************@nwrdny02.gnilink.net...
: Hi
:
: I`m trying to install a third-party control. During
: the install I receive this error...see the url below.
: I have no idea as to the meaning of the error.
:
:
:
www.woodsolutions.com/download/ErrorLoadComp.jpg
:
:
