Good day Pete,
How would you feel about booting the Windows, going through any initial
setup it might offer you (having just come fresh from a vendor), then
resizing after a nice, clean, old-fashioned shut-down?
Perhaps if you are hopeful to copy this dual-boot state to some other
disks you could even look into re-sealing the Windows however the vendor
did that. If so, you might then be inclined to capture an image of your
disk before-hand so you can snoop around in it, looking for wherever
SysPrep's current incarnation is.
At least in Windows XP/2003, Windows uses HKLM\SYSTEM\MountedDevices\ in
the Registry to associate C: with a particular volume under
HKLM\SYSTEM\ControlSet00X\Enum\STORAGE\. Removing the association for
C: causes Windows to re-scan HDDs, looking for a disk matching params
that NTLDR passed on. I'm not sure if this is the same for BOOTMGR and
Windows > 2003.
Good luck. A backup image of the whole disk is always handy.
- Shao Miller
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