Discussion in 'MacBook' started by mossypointman, Jun 26, 2011.

  1. mossypointman macrumors newbie

    Jun 26, 2011
    Replaced HD in MB Black Dual core2 with WD Scorpio Black 750GB, 7200rpm. Disk utility thinks it is a 5.5TB HDD ??? Partition won't work - I/O error reported. Used a second MB with a USB HD dock to partition the WD and it worked. reinstalled in Black MB and found OSX install gives error - "cannot install on this disk" Any ideas???:(
  2. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    When you formatted the drive, what type of partition table did you use? Intel based Macs require a GUID partition table to be able to boot off of a disk.
  3. mossypointman, Jun 27, 2011
    Last edited: Jun 28, 2011

    mossypointman thread starter macrumors newbie

    Jun 26, 2011

    Thanks Bear, Yes I set up a GUID partition.
    Update: I set the WD 750GB drive in a USB dock and connected to another MB, I then used CCC to copy its HD to the WD. That worked OK, in fact I found that I could now boot from the WD via the dock and that Disk Utility now correctly recognised the WD as a 750GB disk. However, when I reinstalled the WD internally in the MB it refused to boot. I tried to boot from the OS X install DVD but that wouldn't work either.

    Good news - The WD 750GB HD is now bootable and is working well. I connected the 2 MB's via Firewire and used Disk Utility to reformat the WD, (one odd thing the partition table was showing as an Apple table?) I reset it to GUID and everything worked from there.

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