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  1. #1
    Can't Format External Hard Drive
    I have WD HD that I briefly used to back up my Mac. I'm trying to format it again and use it like a regular external HD. However, when I go to the "erase" tab on Disk Utility the options are grayed out.

    Help please!

  2. #2
    When you backed up do you have files important for the OS to run. If you have your MACOSX disk handy then use that to format from. How are you connecting WD HD to the computer USB or Firewire or Ethernet.

  3. #3
    Can't Format External Hard Drive
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,257
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, macOS X.15.3,.
    Rep Power
    32
    And make sure the external is connected, powered up and selected in Disk Utility.
    Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  4. #4
    Quote Originally Posted by leadfoot View Post
    When you backed up do you have files important for the OS to run. If you have your MACOSX disk handy then use that to format from. How are you connecting WD HD to the computer USB or Firewire or Ethernet.
    Connected by USB

  5. #5
    Can't Format External Hard Drive
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    25,257
    Your Mac's Specs
    iMac, i7 4GHz, 32GB memory, 1TB Blade Drive, macOS X.15.3,.
    Rep Power
    32
    If it is not appearing via USB in Disk utility, what Mac do you have? External drives do appear in DU.
    Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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