2013 i7 iMac, can't boot external USB-e drive

Discussion in 'iMac' started by gpezzino, Jan 9, 2014.

  1. gpezzino macrumors member

    Joined:
    Mar 27, 2008
    #1
    Late 2013 iMac i7 3.5GHz. I created a clone on an external Seagate UBS-3 drive. The cloned external drive will not boot using a USB-3 cable, but it will using a USB-2 cable. The drive works fine as a USB-3 drive if I boot from the internal drive.

    Is there an incompatibility between these iMac models and external USB-e drives, as far as a boot drive goes?

    Thank you!
     
  2. blueroom macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #2
    My Lacie & Western Digital USB 3.0 drives boot fine.
     
  3. gpezzino thread starter macrumors member

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    Mar 27, 2008
    #3
    What iMac and OS do you have?
     
  4. blueroom macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #4
    Mavericks, on a 2010 MBP, 27" 2009 iMac & 15" 2013 MBP. No problem on any of them.
     
  5. gpezzino thread starter macrumors member

    Joined:
    Mar 27, 2008
    #5
    Thank you. ANyone with a 2013 iMac i7 being able to boot from an external UBS-3 drive? I know they are **supposed** to work, but I would like a direct report. Thanks!
     
  6. yjchua95 macrumors 604

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    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #6
    Yeah, I can boot from mine, no sweat. (3.5GHz i7, 32GB RAM, 512GB SSD, 4GB GTX780M).

    I think you should do a clean install and check whether the problem still persists or not.
     
  7. gpezzino thread starter macrumors member

    Joined:
    Mar 27, 2008
    #7
    Update

    It turns out the problem is drive-specific. I created a clone on a different drive (Toshiba , USB-3) and it worked. The drive in trouble is a Seagate 3TB, the one that works a 2TB, I am not sure if that makes a difference.

    As I said, the Seagate will boot using a USB-2 cable, so the problem is not with the format or file system.
     
  8. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #8
    Have you tried using different USB 3 cables?

    What about different USB ports on the Mac?
     
  9. gpezzino thread starter macrumors member

    Joined:
    Mar 27, 2008
    #9
    I can confirm that the problem is the external Seagate 3TB drive, which does not boot on USB-3. An external WD 2TB clone boots regularly on USB-3. The Seagate WILL boot with a USB-2 cable and will work regularly with a USB-3 cable, except that it will not boot. Something to do with the extra capacity, perhaps?

    Anyway, I have swapped drives, the Seagate is now my Time Machine drive and the WD my clone.

    Thank you all for your advice!
     

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