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External hard drive being ejected for no reason

1505 Views 7 Replies Latest reply: Aug 22, 2012 9:36 AM by John Washburn RSS
jonfromwilsonville Level 1 Level 1 (5 points)
Currently Being Moderated
Aug 17, 2012 2:57 PM

First Lion, now Moutnain Lion. 

 

My external drive that I use for Time Machine gets ejected for no reason.  I disciver this when I awake the computer from sleep.  A pop-up window sayd the drive was not ejected properly.  I go to Time Machine settings and discover the disk is no longer being recognized.  I have to erase the disk and reformat it in order for Time Machine to recognize it and not have it ejected by the OS.

 

I don't see the reason for Time Machine if the external is not stable enough to back up my system. 

 

Does anyone have any idea about this? 

iMac, Mac OS X (10.7.2), Simpletech 500 GB connected
  • petermac87 Level 5 Level 5 (4,065 points)

    jonfromwilsonville wrote:

     

    First Lion, now Moutnain Lion. 

     

    My external drive that I use for Time Machine gets ejected for no reason.  I disciver this when I awake the computer from sleep.  A pop-up window sayd the drive was not ejected properly.  I go to Time Machine settings and discover the disk is no longer being recognized.  I have to erase the disk and reformat it in order for Time Machine to recognize it and not have it ejected by the OS.

     

    I don't see the reason for Time Machine if the external is not stable enough to back up my system. 

     

    Does anyone have any idea about this? 

    Try another USB or Firewire lead.

     

    Pete

  • Bonanza Bucko Calculating status...

    I had a Western Digital My Book external drive using Time Machine.  It worked fine before I installed Mountain Lion..it failed...just stopped and couldn't get recognized by the iMac.  I tossed it out and bought a Seagate Backup Plus for Mac.  That required a reformat of the drive to work.  That didn't work so I returned it to Amazon where I got it.  Then I bought a LeCie 2TB external drive that the local Geek Squad at Best Buy worked with everything. That had the same problem as the Seagate.....said it need to be reformated but the reformat hung and the drive was never recognized by my iMac.

     

    So....I'm beginning to think the problem is Mountain Lion and not all three of those hard drive which failed...or didn't.

     

    Let me know what you think or may know about this.

     

    Thanks,

     

    Bonanza Bucko

  • markwmsn Level 4 Level 4 (3,945 points)

    Bucko, was your Mountain Lion a fresh installation or an upgrade? If it was an upgrade, you may have some leftover corruption on the system disk.

  • Bonanza Bucko Level 1 Level 1 (0 points)

    Markwmsn:

     

    It was an upgrade from Snow Leopard downloaded from Apple.  What to do?...how to clean it up?

     

    BB?

  • markwmsn Level 4 Level 4 (3,945 points)

    I've long been a proponent of doing upgrades in place, but I reached the last straw on that when my 2006 MacBook Pro did so badly running Lion upgraded from Snow Leopard upgraded from .... whatever it came with (Tiger?). This transition, I'm biting the bullet with a clean install on a new drive, manual reinstallation of programs, and manual transfer of data files.

     

    Now that your iMac isn't dealing at all well with external drives, I'm not sure what your next step is. I would say to make a couple of backups and try a clean install, but I have little confidence that the backup would work.

     

    You might consider Pete's suggestion to Jon: try a new cable to reformat that LaCie disk. You might also consider doing that reformat while booted from the recovery partition to avoid any leftover corruption on your system volume.

  • John Washburn Calculating status...

    I am having better working relationship with external Firewire disks and Mountain Lion after doing the following hoop jumping:

    Reset SMC as described in http://macs.about.com/od/usingyourmac/qt/Resetting-The-Smc-System-Management-Con troller-On-Your-Mac.htm

    Basically shut down the OS, unplug electrical connection, hold in power button for fifteen seconds, reconnect power and then power up again.

    I then launched Disk Utility (under Utilities in Applications) and performed a repair permissions on my startup disk.

    In my experience, it fixed some permissions on files in System-Library-Extensions-IOFirewWreFamily.kext

     

    Afte another restart, things have been better.

    I have had a disk disappear with a "Eject without doing the right thing" message. When I power cycled the disk, it reappeared.

    For now I am happy that Time Machine works.

    Hoping Apple supplies a solid fix.

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