External hard drive not visible/ help

Discussion in 'Mac Basics and Help' started by TheTruth101, Apr 8, 2018.

  1. TheTruth101 Suspended

    Mar 15, 2017
    Hi guys.

    I have this 2TB Toshiba hard drive, USB only. I connected it and is not showing up on the desktop. The light keeps blinking. It appears in the Disk Utility but does not want to mount. I assume the directory is messed up and I have to rebuild it.

    What app can do that nowadays? Last time I did it was like 10 years ago.

    Thank you.

    BTW, the HD is not making any strange noises so I assume is the directory.
  2. Darmok N Jalad macrumors 65816

    Darmok N Jalad

    Sep 26, 2017
    What format was it in, and could a Windows machine possibly read it?

    Disk Utility should be able to set it up again, but that would involve erasing all contents. It's pretty concerning if the drive is not readable anymore, as that suggests more serious problems. Drives don't usually get corrupted out of the blue.
  3. TheTruth101 thread starter Suspended

    Mar 15, 2017
    It is mac, it is my TimeMachine back up drive actually... glad I can erase it but I would like to fix the directory. No reason to reformat.

    I believe I unplug it without dragging it out. That is why I think is just the directory that needs to be rebuilt.
  4. chscag macrumors 68030


    Feb 17, 2008
    Fort Worth, Texas
    If it's a Time Machine backup drive and the file allocation table is messed up and the directory needs to be rebuilt, it's best to erase and re-format it. You can't depend on using that drive to restore from after that. Just start over or not use that drive any longer for Time Machine.
  5. AidenShaw macrumors P6


    Feb 8, 2003
    The Peninsula
    What filesystem is on the drive? Modern journaled filesystems are very resilient about handling unplanned power failures or disconnects.

    PS: you might get better help by moving this to an Apple OSX forum - since this forum is about Apple and industry trends.
  6. techwarrior macrumors 65816


    Jul 30, 2009
    You might try leaving it unplugged and shutdown the Mac. When you boot back up again, wait for the system to be fully ready, then plug the drive back in.

    If that doesn't help, unplug the drive and do a NVRAM reset or Safe Mode boot, then boot normally and plug it in again.

    Unsafe removal of external drives (TM) has on a few occasions done this to me. The OS still thinks the drive is connected, so when you plug it in again, it gets confused. Mostly happened with power outages.
  7. Fishrrman macrumors P6


    Feb 20, 2009

    Is there any data on the old drive that is not already stored somewhere else?
    What I'm trying to say is -- is the data on the drive anything you REALLY need anymore?

    If not, I suggest you erase the drive (either on the Mac or on a PC), and then "start over".

    You didn't tell us which version of the OS you're using (that's ALWAYS important to note when you post a question).

    I would erase the drive to Mac OS extended with journaling enabled, GUID partition format.

    However, I WOULD NOT use Time Machine.
    I recommend that you give either CarbonCopyCloner or SuperDuper a try instead.
    Both are FREE to download and try for 30 days.

    Either of these will create a BOOTABLE COPY of your internal drive that you can just reach for and boot from in an emergency (such as an "I can't boot!" moment).
    All your data is on it in "finder format", just as on any other drive.

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