External Hard Drive Acting Up

Discussion in 'Mac Basics and Help' started by Huntn, May 15, 2019.

  1. Huntn, May 15, 2019
    Last edited: May 15, 2019

    Huntn macrumors P6


    May 5, 2008
    The Misty Mountains
    I have an external 3TB hard drive formatted with MacExtended Journaled that I am using as my Time machine backup for my MBP. It is partitioned into two 2 partitions. One partition seems top work normally, I can access it, write to it, however it won't eject.

    In Disk Utility the non-functional partition(TM backup) appears as grayed out. I can get info on it, but it does not respond to Mount, Repair, or Erase. Both Repair and Erase result in operation failure messages. I've also tried to unmount the other partition which I can't do, and erase the entire drive. Trying to erase the entire drive, results in a failure message. It never gets past the "unmounting the drive" first step.

    I have also unplugged it and plugged it back in, I have restarted my Mac. Any ideas? Or I need to get a next external drive? See my signature for hardware info.

    Update: Soon after posting this, somehow the partition that would not unmount, finally did unmount, and I was able to erase the entire disk and repartition it. What happened? I don't know. Is there anything else I should check?
  2. mikehalloran macrumors 65816

    Oct 14, 2018
    The Sillie Con Valley
    Do not partition your Time Machine drive, In fact, do not use it for anything else.

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1 May 15, 2019