Brink
I tried disabling the fast start - with W7 drive disconnected
shut down W8, reconnected W7 drive and rebooted W8.
Shut down W8 and rebooted W7 - that worked, no chkdsk was run
I rebooted W8 - slowly and changed the drive letters on my W7 drive to N:, O:, P:, & Q:
Then did a regedit to set...