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  1. #1

    iMACGuru's Avatar
    Member Since
    Aug 12, 2008
    Miami Beach
    iMac 20" 500GB 4GB RAM
    External Hard drive Icon Disappears
    I've been using an Iomega external drive as my Time Machine since I bought my iMac in 2008. Now that I have upgraded to Mountain Lion the external drive icon keeps disappearing and Time Machine fails to backup my files. The Disk Utility does not list the external drive once the icon disappears. If I turn-off and then turn-on the external drive the icon reappears. However, it will eventually disappear again.

    I have tried all solutions that I came across on numerous forums and apple discussions to no avail. Any help will be greatly appreciated.

  2. #2

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Texas, where else?
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    In order to not re-iterate all the things you've tried from "numerous" forums and apple discussions - most folks are going to want to know what you've already tried.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    If the drive was purchased back in 2008 and is mounting and dismounting randomly, it's time to buy a new one. Nothing worse than having an unreliable external hard drive as backup.

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