can not unmount Machintosh HD

I attempted to recover to different system from Apple Time Machine it eventually failed due to a untimely network error. Now I can not umount disk on the targeted machine. When I say I can not unmount it I mean I CAN NOT unmount it no matter what approach I use:
Disk utility -- no
Recover -- no
terminal -- no
force via terminal --no
set as a target disk -- no

terminal commands tried were unmout, unmountDisk, unmountVolume
when using recovery on target machine terminal returns the command "no such command"   (so terminal is currupt?)
I have tried all the logical options Google has presented me, I am hoping someone here has a different solution.
Thanks
Bill DohertyNetwork AdministratorAsked:
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Peter HutchisonSenior Network Systems SpecialistCommented:
The correct command is umount (not unmount) followed by the mount path.

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arnoldCommented:
to unmount the drive/partition without regard to it still being used, i.e. there is a terminal, finder window that holds it...
umount -f mount_point
i.e. if you mounted the drive as /mnt
umount -f /mnt will dislodge the drive...
Though  I would suggest you check whether there is a timemachine restore still going, finder directory open on that path, or a terminal window in /mnt.....
serialbandCommented:
Another sure fire way is to reboot.
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