Reformatted hard drive now unreadable

Discussion in 'MacBook Air' started by kees.chambo, Sep 11, 2014.

  1. kees.chambo macrumors newbie

    Sep 11, 2014
    I recently swapped from a PC to Mac but kept my old hard drive. I reformatted the hard drive to Mac OS Extended (Journaled) but immediately after could no longer be read by either Mac or PC!
    Files were backed up but i need the hard drive to work again, suggestions?
  2. flowrider macrumors 601


    Nov 23, 2012
    Have you tried running "Repair Disk" in Disk Utility? And, if you have it you could try TechTool Pro or Disk Warrior to try and repair the disk.

  3. macs4nw macrumors 601


    When you reformat a hard drive, it erases all the content on that drive, so naturally you can't read from it anymore, but that old HD should now be ready to be written to by your Mac. Good thing you had those files backed up!
  4. Dweez macrumors 65816


    Jun 13, 2011
    Down by the river
    I don't believe any Windows OS can read Mac formatted devices, unless formatted as ExFAT.

    When you say it's not readable, what exactly do you mean? Does the drive mount when connected?
  5. joshlalonde macrumors 6502


    Jul 12, 2014
    Perhaps you didn't actually make a partition. So its just a blank amount of space with no file system..

    Try formatting it again, doesn't hurt. As long as your data is backed up.

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