Late 2012 27" iMac - not recognising new internal HD

Discussion in 'iMac' started by PMQ, May 30, 2018.

  1. PMQ macrumors newbie


    May 29, 2018
    Just installed a new internal 4TB HDD + OWC Temp Sensor in a Late 2012 27" iMac; with High Sierra.

    Drive seems to be purring away quite happily - so hopefully physical install OK.

    However new drive is not showing in Disc Utilities.

    So I need some #101 Terminal command line advice.

    'diskutil list' - produces the attached list.
    1. Do I use disk1 or disk2?
    2. And what are the required Terminal commands to put things to right?
    Thanks in advance for any help.

    Attached Files:

  2. Fried Chicken macrumors 6502

    Fried Chicken

    Jun 11, 2011
  3. mbosse macrumors 6502

    Apr 29, 2015
    Vienna, Austria
    This appears like only the FusionDrive part (128GB) of your iMac is showing? One reason for all you describe could be that you installed the power cable to the new hard drive correctly, but not the data cable.

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