Disk power management does not work after Service Pack 4.

A. After Service Pack 4 is applied the Windows NT operating system accesses the disk every 5 minutes which will interfere with disk power management features. This disk access is caused by a time stamp used by the Event Log service and was intended for NT Server only but has been enabled on Workstation.

To fix this perform the following:

  1. Start the registry editor (regedit.exe)
  2. Move to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
  3. From the Edit menu select New - DWORD value and enter a name of TimeStampInterval
  4. Double click the new value and set to 0
  5. Close the registry editor
  6. The change should take immediate effect. If you change from 0 to another value then a reboot is required.

See http://support.microsoft.com/support/kb/articles/Q194/7/49.ASP for more details but this has been fixed in Service Pack 5.


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