USB HDD only show up on one of Macs

Discussion in 'OS X El Capitan (10.11)' started by AppleHater, Nov 28, 2015.

  1. AppleHater macrumors 6502a

    Jun 9, 2010
    I have a WD USB hard drive that I've using with my MBP. Now, I connect it to my new iMac and I'm having all kinds of issues. First, I had to authenticate every time when I try to write to it or modify anything.

    I searched up internet to use sudo command to remove that authentication requirement. Instead, the drive stops showing up on the left panel of Finder, nor iMovie, nor Lightroom.

    I can access it fine from the desk top using the desktop icon, but it's not accessible other ways. What should I do to fix this? This is my main data drive and it'll be a pain in the butt if I have to reformat this...
  2. IHelpId10t5 macrumors 6502

    Nov 28, 2014
    Right-click the drive's icon, choose "Get Info", click the lock in the lower right and authenticate yourself, then enable the "Ignore ownership on this volume" check box.
  3. AppleHater thread starter macrumors 6502a

    Jun 9, 2010
    Problem is that that selection itself won't show up for this drive. Even on my MBP, that open is gone for the drive, although I have no other symptoms with it that have with the iMac.
  4. AppleHater thread starter macrumors 6502a

    Jun 9, 2010
    To add more, I can unmount it from Path Finder, but I get an error if I try to unmount it from the terminal. It asked me to use diskunmount.
  5. Rodan52 macrumors regular


    Sep 21, 2013
    Melbourne, Australia and Bali, Indonesia
    Have you tried repairing it in Disk Utility if it is visible?
  6. AppleHater thread starter macrumors 6502a

    Jun 9, 2010
    Thing is that verify or repair option doesn't even come up. If I choose it from the menu bar, the drive doesn't show up among choices.
  7. Partron22 macrumors 68020


    Apr 13, 2011
    So USB 3.
    Have you tried moving the drive farther away from the Mac before startup?

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