Can't mount hard drive

Discussion in 'macOS Sierra (10.12)' started by dfelix, Apr 1, 2017.

  1. dfelix macrumors member


    Jul 13, 2011

    I usually am quite savvy when it comes to fixing computers, but I stumbles unto something that has me stumped. I can't mount one of my externals. The volume just shows up greyed out in disk utility like so

    In Disk Utility, my drive shows up greyed out


    when I double click it to mount it, it tells me to go do it in Disk Utility

    diskutil cs list output


    The drive is encrypted as you can see, but should be unlocked. What's my move here?
  2. dfelix thread starter macrumors member


    Jul 13, 2011
    you have to find what's locking up the disk. With the disk no. you cs listed earlier, you then have to grep:

    $ ps aux |grep disk4

    it will tell you something like this
    root 1141 44.7 2.5 4605972 426052 ?? R 11:06AM 1:56.00

    The fsck_hfs -y process is what 's hogging the drive. Kill its PID:

    $ sudo kill 1141

    and macOS will tell you that it couldn't repair the drive, and you should consider backing up its data. macOS will then release the drive back to you, but it's contents will be read only. Here you have a few options:

    1) Try to disk util first aid it. Do it via the GUI, it will probably tell you the catalog is bad

    2) Move all data from the drive, format it, move the data back on it.

    I'm still not sure what caused this, but I'm guessing Apple messed with core storage in anticipation of APFS. If this happens to you, I hope this "guide" can be of some use.

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