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10.5: Avoid 'resource busy' errors in Disk Utility System 10.5
In attempting to use Disk Utility to make a .dmg image file archive of a volume on my Mac under Leopard, I got a new error message that did not appear before with Tiger: Unable to create "Drive To Backup" (Resource busy).

Apparently in Leopard, you have to first unmount the volume you want to back up before you attempt to backup the image from the File » New » Disk Image From menu selection.

[robg adds: A commenter on the queue review site notes he had the same problem, but believes it to be a bug (which he filed). In the interim, though, this solution works.]
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10.5: Avoid 'resource busy' errors in Disk Utility | 2 comments | Create New Account
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10.5: Avoid 'resource busy' errors in Disk Utility
Authored by: RobLewis on Jan 01, '09 12:00:00PM

Thanks for this tip. When I got the "resource busy" error, I tried using Disk Utility's "Unmount" button before trying to create the disk image, but this doesn't work because DU no longer sees the drive (didn't it use to have a "Rescan" command to find drives that weren't mounted?)

I unplugged and replugged the FireWire cable so Disk Utility would rediscover the drive, then in the Finder, dragged the drive icon to the trash. Only then was I able to create the disk image. Poor design!

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10.5: Avoid 'resource busy' errors in Disk Utility
Authored by: lexicon5 on Jul 15, '09 06:35:56AM

Works perfectly well...and this issue is still present in 10.5.7.
Unmounting the partition as opposed to ejecting the disk is what's required.
Scratching head. Can't figure out why Apple would redesign Disk Utility to not unmount first.

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