When you write data to an external storage device such as a
USB flash card reader or a Magneto-Optical (MO) drive, it may take a very long
time for all the data to be written to the device. If you examine a bus trace
of that device, you notice that there are many duplicate write operations
(where the same data is written to the same destination).
This problem occurs because pages of data that are marked to
be written to the storage device may be written by the modified page writer or
the mapped page writer (these components are part of the Memory Manager) and to
the lazy writer component (this component is part of the Cache Manager). These
two write operations do not correctly synchronize their lists of pages that are
to be written to the device. Therefore, a duplicate write operation may occur.
This duplicate write operation causes performance degradation because the same
information is written two times to the same storage device.
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest Windows XP service pack
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note
If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
You must have Windows XP Service Pack 1 (SP1) installed before you
install this hotfix.
information about how to obtain Service Pack 1 for Windows XP, click the
following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest Windows
XP service pack
You must restart your computer to apply the changes after you
install this hotfix. However, you do not have to restart your computer
immediately after you install this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file
attributes (or later) that are listed in the following table. The dates and
times for these files are listed in coordinated universal time (UTC). When you
view the file information, it is converted to local time. To find the
difference between UTC and local time, use the Time Zone
in the Date and Time tool in Control Panel.
Microsoft Windows XP SP1 32-Bit
Date Time Version Size File name
22-Apr-2004 22:21 5.1.2600.1518 1,912,320 Ntkrnlmp.exe
22-Apr-2004 22:21 5.1.2600.1518 1,968,128 Ntkrnlpa.exe
22-Apr-2004 22:21 5.1.2600.1518 1,940,480 Ntkrpamp.exe
22-Apr-2004 23:01 5.1.2600.1518 2,063,872 Ntoskrnl.exe
Microsoft Windows XP 64-Bit Edition Version 2002 SP1
Date Time Version Size File name
22-Apr-2004 22:25 5.1.2600.1518 5,830,144 Ntkrnlmp.exe IA-64
22-Apr-2004 22:25 5.1.2600.1518 5,773,568 Ntoskrnl.exe IA-64
To download the correct hotfix, select the package that has a
value of 4/27/2004
, not the package that has a CreateDate
value of 10/20/2003
. The correct download files will have the file attributes that
this article lists earlier.
Use the Ntorkrnl.exe file
version to determine the hotfix version that is installed on your computer. To
do this, follow these steps:
- Click Start, click Search,
and then click All Files and Folders.
the All or part of the file name box, type
and then click Search.
- After the search results are displayed, right-click the
Ntoskrnl.exe file in your Windows\System32 folder, and then click
Properties to view the Modified
To work around this problem, turn off write caching for the
storage device. For a USB or removable storage device, configure the caching
policy to use the Optimize for quick removal
option in Device
Manager. To do this, follow these steps:
- Click Start, right-click My
Computer, and then click Properties.
- Click the Hardware tab, and then click
- Expand Disk Drives, right-click your
storage device, and then click Properties.
- Click the Policies tab, click
Optimize for quick removal, and then click
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.
This problem only affects Windows XP with SP1 installed or
integrated. It does not affect Windows XP without SP1 installed, Microsoft
Windows 2000, or Microsoft Windows Server 2003.