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OS X - Operating System General OS operation information and support

iMac unmounts external drives


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dhall820

 
Member Since: May 03, 2011
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I have a long-standing problem with my 24" iMac. When running Time Machine backups, the backup would proceed normally until a notice appeared that the backup disk had been ejected improperly last time. At that point, the backup would stop. The drive was definitely not ejected improperly. I erased and reformatted the drive several times, with no results. I have restarted the iMac and tried everything I can think of. At first, I thought this was a TM problem, and then a problem with the external hard drive. However, this behavior now occurs when I use a USB reader to download Canon photos to the internal drive. (The same USB reader works fine on my MacBook Pro.) The problem seems somewhat random; it appears that there is a triggering event by the system, but I can't figure out what it is. I'm running 10.6.7. I spent a huge amount of time on this with Apple while I still had AppleCare, to no avail. Can anyone help?

Apologies if there is a thread for this and the problem has been solved. This is my first post, and I'm just starting to poke around.
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dtravis7

 
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Are the drives plugged directly into the iMac and not Via a USB Hub?
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dhall820

 
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They were plugged in via USB hub.
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dtravis7

 
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Reason I asked is I have recently had issues like yours and one of my 7 port USB Hubs was causing everything plugged into it to drop. Went to the other hub nothing so far.
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dhall820

 
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I'll keep that in mind as a possible cause. I have other, less-sensitive USB devices (printers, scanner) that I'll plug into the hub instead. The problem was so bad that I gave up on Time Machine and bought a copy of SuperDuper. It's not necessarily the kind of backup I want on a regular basis, but it seems to be capable of stopping the drop out from occurring. Is there a fundamental reason that the hub might cause a problem? If not, I could also buy another hub. (I know the problem was not caused by an accidental disconnect.)
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