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Can't unmount my External Hard Drive?

11499 Views 15 Replies Latest reply: Feb 27, 2014 5:52 AM by CodEjunKi RSS
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elliswicks Calculating status...
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Nov 13, 2012 4:14 AM

Hi guys,


I've been using my Seagate Portable Media 500GB external hard drive for Time Machine on Mountain Lion.


Last week, Time Machine's backup failed, with the message "Unable to complete backup. An error occurred while creating the backup folder."


Using Disk Utility, I verified the disk which asked me to repair it. On trying to repair it, I received the message "Couldn't unmount disk". I received this message also when trying to Erase or Partition the drive and I don't know how to take it further.


The drive is still visible in Finder and I can still access its contents.


I've also tried using a new power cable for the drive and I'm having the same results.


Any advice would be great!



iMac (21.5-inch Mid 2011), OS X Mountain Lion (10.8.2)
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