Q. When you attempt to start Windows XP, you receive a 0x8009001d error?

You will receive a 0x8009001d error if you modified the boot drive letter assignment or the system drive letter assignment in the HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices.

Microsoft defines the System Partition as the partition that contains the startup files, NTDetect.com, NTLDR, and Boot.ini.

Microsoft defines the Boot Partition as the partition that contains the system files (%SystemRoot%\System32).

Microsoft does NOT support changing the System Partition or Boot Partition drive letters in Windows XP.

NOTE: See tip 2596 ยป How do I change the System/Boot drive letter in Windows 2000?


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