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I am currently looking for a solution (if it exists) to change my external 4 TB SATA HD from a GUID Partition Table to an MBR with an exFAT volume.

I did not see an already answered solution but if there is one please let me know!

I thought I would be using the HD for my mac 10.9.5. However, I have boatloads of data on other hard drives and have decided maybe I want to use this disk as a master boot disk for my PS4. I tried reformatting the whole disk in Disk Utility but the Master Boot Record option is not available. The current status of the HD is as follows:

HD Description

When I attempt to re-partition the HD, I followed the partition process, and all seems well, until I end up at this screen:

Problem Area

Is there a way to completely erase the partition table/reformat to exFAT? (save the cash)

Or is my best bet to invest in another external HDD? (lose the cash)

  • Yes. I erased all Mac OS Extended (Journaled) volumes in untitled 1. Also in the 4 TB ASMT 2105 Media External. Receiving the same error on the partition options page. – Donner Jul 31 '17 at 17:59
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    2TiB limit MBR – klanomath Jul 31 '17 at 18:21
  • @klanomath so does that mean I am only able to use a 2 terrabyte external HD with an exFAT partition set as an MBR? – Donner Jul 31 '17 at 18:36
  • On a 4 TB disk configuring two partition may work. The second partition has to start before the 2 TiB-limit – klanomath Jul 31 '17 at 18:41
  • @klanomath attempted to add pictures of the partitions however I don't have enough rep to do so. The journaled partition (partition 1) is less than 200GB and the ExFat partition (partition 2) is 3.69TB. Still will not allow me to choose the Master Boot Record option on the ExFAT partition. – Donner Jul 31 '17 at 18:58

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