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I have a 2 TB external firewire drive that won't unmount to be erased. I think it won't unmount because fsck_hfs is running, but I don't know how to confirm what drive fsck is running on.
If I can confirm that it's running on the external drive, can I kill the process? All I really want to do is erase the drive so I can start fresh with a new backup (assuming the drive is still good) but I can't because it won't unmount...

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Since you don't care about the contents of the drive, you can be forceful here.

Use fuser -ck <mountpoint> to kill any process holding the mount open, and the you can do whatever you want to erase and format the drive.

BowlesCR
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