Unmount disk (-10000) -?????? Drive will not format.

I have a Western Digital external firewire Hard drive that won't repair, mount or stay correctly partitioned. I cannot erase drive. When I plug it in it says this drive cannot be read: intitalize, Ignore, eject. Intitalize does nothing. Each time to mount drive from Disk utility, I have to partition it. Then the drive will not show up till I verify then:
I get error:
Verify volume failed with error Could not unmount disk (-10000)
help?
_Richard

There is a question as to whether the enclosure or the drive itself is at fault. Does the enclosure also have USB capability? If so, you could see what it does if connected by USB. Same thing, the drive itself may be bad, and if still under warranty, you could probably get WD to replace it. If the drive works properly on USB, then I would be suspicious of the firewire bridge in the enclosure.
Also, if you can, try a different cable and see if that makes any difference.
Good luck!

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Could not unmount disk (-10000)

Hello all.
Just a quick one...
Just tried to verify/repair my External LACIE using Disk Utility, and found that I get this error...
Repairing disk for “LACIE HD”
Repair attempted on 1 volume
0 HFS volumes repaired
1 volume could not be repaired
Repairing disk failed with error Could not unmount disk (-10000)
Any ideas why this would happen? I have used Disk Utility before to Verify my External Drive...?! Any help would be much appreciated.
Kind Regards.
Jamesy!

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Unmount disk (-10000) -?????? Drive will not format.

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