Put External Drive in Mac Pro, not recognized?

Discussion in 'Mac Accessories' started by matty1551, Apr 22, 2014.

  1. matty1551 macrumors 6502

    Jul 7, 2009
    I have a WD Mybook 3tb usb3 external drive that I use for backups and to store some media files. I've been thinking that I would get better read and write speeds if I took the drive out of its case and installed it directly in my mac pro.

    Well I did this, however, it says the hard drive can not be read. Upon putting the drive back in its case and connecting via usb, it is recognized just fine.

    What am I missing here? The drive is already formatted for Mac so I don't understand what the issue could be.
  2. Marty62 macrumors 6502

    Mar 11, 2010
    Berlin formerly London
    Probably just some "firmware" in the WD enclosure, between the USB socket
    and the Hard drive itself.

    May be that you would need to re-format the drive to use it internally.

  3. Fishrrman macrumors P6


    Feb 20, 2009
    When you installed the "bare" drive into the Mac Pro, did you open Disk Utility?

    Does DU recognize "the presence" of the drive "on the internal bus" ??

    Even if it doesn't mount on the desktop ??
  4. matty1551 thread starter macrumors 6502

    Jul 7, 2009
    It is on the internal bus. It's just not formatted for some reason. Upon further research I found some forum posts stating that WD Mybook's encrypt your data in some form.

    After copying my external content to my internal and reformatting in Disk Utility, it is now functioning as expected.

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