External drive not detected on one specific iMac

Discussion in 'iMac' started by jahbuzzz, May 7, 2019.

  1. jahbuzzz macrumors member

    Joined:
    Jul 9, 2009
    #1
    Hi All,
    Looking for some help. All of a sudden my iMac will not detect my seagate 4tb drive. 3.49tb available. I'm working off Mojave 10.14.4. Its showing up on other computers. Any ideas?
    TIA
     
  2. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #2
    What FORMAT is the drive?
    Is there any encryption on it?
     
  3. jahbuzzz thread starter macrumors member

    Joined:
    Jul 9, 2009
    #3
    Its a formatted seagate drive. Not encrypted asaik
     
  4. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #4
    What is the format?
    Is it HFS+?
    Is it APFS?
    Is it a PC format?
     
  5. BigMcGuire Contributor

    BigMcGuire

    Joined:
    Jan 10, 2012
    Location:
    California
    #5
    Do you see it in Disk Utility? I had something similar happen once on my MBP. It stopped showing drives I connected to it in Finder. I had to manually mount disks in Disk Utility until a reboot then everything went back to normal. :p
     
  6. jahbuzzz thread starter macrumors member

    Joined:
    Jul 9, 2009
    #6
    APFS I presume - I formatted it out of the box.
    Image from disk utility on other mac attached.
     

    Attached Files:

  7. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #7
    It's formatted HFS+.
    See: "4tb USB External Physical Volume OS X Extended".

    Just wondering -- did you use any kind of encryption on the drive?

    Disclaimer:
    I don't use APFS. I'm an "HFS+ forever guy".

    Did I read somewhere that an APFS-booted Mac won't mount an HFS+ drive that has been encrypted? (I could be totally wrong on this)

    Others, please jump in and correct me if I'm wrong about that!
     
  8. jahbuzzz thread starter macrumors member

    Joined:
    Jul 9, 2009
    #8
    Thing is it was working perfectly then all of a sudden it doesnt show up
     
  9. nambuccaheadsau macrumors 68000

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #9
    If you mean doesn't show on the desktop go into Finder Preferences and make sure the option to show external disks is selected.
     
  10. jahbuzzz thread starter macrumors member

    Joined:
    Jul 9, 2009
    #10
    Hi thanks - one of the first things I did though. It seems I have baffled the internet with this one!
    --- Post Merged, May 13, 2019 ---
    Wow! Just wow! Happened upon this nugget while doing a search and it worked!

    "Try a Super Slow Jam
    Strange but true, some users found that their thumb drives work when they plug it in extremely slowly. When they try and plug in the USB flash drive normally, their PC’s don’t recognize the drives. But if they gently slide them into the port in slo-mo, their drives are recognized! Go figure."
     
  11. mikehalloran macrumors 65816

    Joined:
    Oct 14, 2018
    Location:
    The Sillie Con Valley
    #11
    Your image says you didn't.
     

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10 May 7, 2019