HD intermittently mounts/unmounts

Discussion in 'iMac' started by nyroger, Jan 17, 2014.

  1. nyroger macrumors newbie

    Joined:
    Jan 7, 2014
    #1
    I have a HD that intermittently mounts/dismounts without any input from me. My setup is as follows: HD #1 is the problem HD; it is connected to iMac via Thunderbolt/firewire adapter. HD #2 is daisy chained to #1 via firewire 800/400 cable. Equipment is late 2013 iMac with Maverick OS.

    As stated above HD #1 will mount on the desktop and then without any input from me it will suddenly dismount. Later it will suddenly mount again. This activity continues to repeat over and over. I have no problems with HD #2. Thanks for your help.
     
  2. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #2
    Is the problem disk FW powered or does it have it's own power supply?
     
  3. chabig macrumors 68040

    Joined:
    Sep 6, 2002
    #3
    My Thunderbolt drives do that occasionally. I shut down, reseat the plugs, and reboot. That usually clears it up.
     
  4. nyroger thread starter macrumors newbie

    Joined:
    Jan 7, 2014
    #4
    HD intermittently mounts/unmounts

    HD is powered by 110v.
     
  5. martinm0 macrumors 6502a

    Joined:
    Feb 27, 2010
    #5
    Is the second drive powered by its own plug, or is it powered by the first drive? If it's powered by the first drive, try disconnecting the second drive for a while and see if the mounting issue is resolved. Possibly the second drive is somehow getting the bulk of the power over the first drive??
     

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