ExFAT drive won't mount

Discussion in 'OS X Mountain Lion (10.8)' started by spookybathtub, Jan 12, 2013.

  1. macrumors newbie

    Joined:
    Feb 15, 2008
    #1
    I can't mount a USB 3 hard drive on either of my two macs. One is 10.7.5 and the other is 10.8.2. The drive is ExFAT formatted with a Master Boot Record (MBR). It mounts just fine on a Windows 7 PC, where it was formatted. I have another ExFAT MBR drive that works on all computers. Attached is a screenshot from Disk Utility, and this is what System Profiler says:

    Code:
    Capacity:	1.5 TB (1,500,301,909,504 bytes)
      Removable Media:	Yes
      Detachable Drive:	Yes
      BSD Name:	disk6
      Product ID:	0x2320
      Vendor ID:	0x0bc2  (Seagate LLC)
      Version:	 1.00
      Serial Number:	NA4G2DVT
      Speed:	Up to 480 Mb/sec
      Manufacturer:	Seagate
      Location ID:	0x05100000 / 2
      Current Available (mA):	500
      Current Required (mA):	36
      Partition Map Type:	MBR (Master Boot Record)
      S.M.A.R.T. status:	Not Supported
      Volumes:
    Dickhute:
      Capacity:	1.5 TB (1,500,298,346,496 bytes)
      File System:	ExFAT
      BSD Name:	disk6s1
      Content:	Windows_NTFS
      Volume UUID:	239B8B0D-222B-3B50-B147-FAC9ABFAFECB
    Anyone know how to fix this in Mac OS X? It's interesting that the Content descriptor is Windows_NTFS. The drive is a Seagate Expansion Portable.
     

    Attached Files:

  2. macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #2
    Format it using the Macs Disk Utility, single partition only.
     
  3. thread starter macrumors newbie

    Joined:
    Feb 15, 2008
    #3
    Thanks, but it's a bit too late for that, now that it's full of important data. Are you certain that OS X can only read ExFAT volumes which were formatted by a Mac, or is that just a guess?
     
  4. macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #4
    It sounds like some funky portioning.

    FYI if the data's important you should have it backed up.
     
  5. macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #5
    I wonder why it says "Content: Windows_NTFS"? Can you somehow check that the filesystem is pure ExFAT and didn't get modified somehow.

    It shouldn't matter where it was formatted unless one of the formatting programs is buggy.
     
  6. thread starter macrumors newbie

    Joined:
    Feb 15, 2008
    #6
    Yeah that does seem weird. Any ideas on how to check that?
     
  7. macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #7
    Futzing around with the partition table can cause your data to vanish.

    Back it up, reformat it using Disk Utility.
     

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