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Old Jan 12, 2013, 04:23 PM   #1
spookybathtub
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ExFAT drive won't mount

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.
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Old Jan 12, 2013, 04:26 PM   #2
blueroom
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Format it using the Macs Disk Utility, single partition only.
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Old Jan 12, 2013, 04:28 PM   #3
spookybathtub
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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?
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Old Jan 12, 2013, 04:33 PM   #4
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It sounds like some funky portioning.

FYI if the data's important you should have it backed up.
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Old Jan 12, 2013, 04:35 PM   #5
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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.
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Old Jan 12, 2013, 04:36 PM   #6
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Yeah that does seem weird. Any ideas on how to check that?
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Old Jan 12, 2013, 04:38 PM   #7
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Futzing around with the partition table can cause your data to vanish.

Back it up, reformat it using Disk Utility.
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