Disk Utility. Cannot format disk with MBR

Discussion in 'macOS Sierra (10.12)' started by hawkeye_a, Apr 8, 2017.

  1. hawkeye_a macrumors 6502a

    hawkeye_a

    Joined:
    Jun 27, 2016
    #1
    I just purchased an external hard drive (WD Elements 4TB), and I'm trying to format the drive using 'Master Boot Record', which I have done before on other hard drives.

    Unfortunately, the new drive is using GUID, and I cannot seem to convert it to MBR. It always gives me an error, and I cannot seem to partition the drive using Disk Utility either.

    I've tried to do the above on macOS Sierra and Snow Leopard(MBR option is grayed out) to no avail.

    Anyone know why this is?

    Cheers
     
  2. Yahooligan macrumors 6502a

    Yahooligan

    Joined:
    Aug 7, 2011
    Location:
    Illinois
  3. mfram macrumors 65816

    Joined:
    Jan 23, 2010
    Location:
    San Diego, CA USA
    #3
    Because there is a 2TB size limit on some disks with MBR depending on the block size the drive reports. Recent versions of Windows can read GUID partitions too.
     
  4. hawkeye_a thread starter macrumors 6502a

    hawkeye_a

    Joined:
    Jun 27, 2016
    #4
    Apologies for not posting the error... here it is...

    mbr.jpg

    @mfram I do have another 4TB HDD which I did manage to format years ago with MBR.

    Also, I'm trying to use the exFat format.

    Any suggestions? Or just stick with GUID?

    Cheers
     
  5. mfram macrumors 65816

    Joined:
    Jan 23, 2010
    Location:
    San Diego, CA USA
    #5
    Maybe the Mac doesn't like the parameters this drive reports. My guess is block size. Do you have access to a Windows box to format it? That might work.

    What kind of Windows do you want to share the data with? If it's at least Windows 10 I think it can read the GUID partitions fine. If you aren't sharing with Windows then why use exFat?
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #6
    I believe you are correct. If this is not to be used for a boot drive, I don't think it will matter if it is GUID.
     
  7. hawkeye_a, Apr 9, 2017
    Last edited: Apr 9, 2017

    hawkeye_a thread starter macrumors 6502a

    hawkeye_a

    Joined:
    Jun 27, 2016
    #7
    The HDD will mostly be used on a Mac, but also occasionally on Windows XP-10(not as a boot disk) and a Raspberry Pi.

    I remember (this is going back 8 years), that the PS3 would only recognize a HDD formatted with MBR and not GUID.
     

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