I meant the serial id of the physical disk, not the volume id on the partitions. If the disk has been cloned with dd under Linux (which given Mark is involved is probably the case) then the partitions on the drive will be identical in every way.

The serial number of the physical drive will be different, I believe WinXP uses this as one of the variables that go into its activation hash.
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Remind me to change my signature to something more interesting someday