WinXP doesn’t hibernate if RAM is ~2gb or more.

http://www.codinghorror.com/blog/archives/000555.html

Here’s the hotfix: http://support.microsoft.com/?kbid=909095
http://www.u-g-h.com/InsufficientSystem … LIVED.aspx

To prepare the computer to hibernate, the Windows kernel power manager requires a block of contiguous memory. The size of this contiguous memory is proportional to the number of physical memory regions that the computer is using. A computer that uses lots of RAM is likely to use more physical memory regions when the computer prepares to hibernate. Therefore, a larger amount of contiguous memory is required to prepare the computer to hibernate.

Additionally, the number of physical memory regions varies according to the programs, services, and device drivers that the computer uses. Therefore, the hibernate feature occasionally fails.

When the Windows kernel power manager detects that the hibernate feature has failed, the hibernate feature remains disabled until you restart the computer.[ad#ad-1]

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