Old Macintosh HD not recognized by iMac

Discussion in 'iMac' started by TheGuru, Jul 31, 2015.

  1. TheGuru macrumors newbie

    Joined:
    Jul 31, 2015
    #1
    Hello folks!
    This is my 1st post in this forum and would like some assistance.
    Apple had replaced a 3TB HD on my iMac and I currently have plugged in the old HD into a USB 3.0 enclosure which is Mac compatible. The issue is iMac recognizes the External hard drive as 'Macintosh HD' but I am not able to view the content on the HD.

    This is the error I am seeing when I click on the HD in Disk Utility program

    "This Fusion Drive is missing a disk. Would you like to rebuild this Fusion Drive?"

    Any suggestion how I can view data on this HD or do I need to Rebuild the disk which will erase all the data on the drive.

    Thank you.
     
  2. matreya macrumors 65816

    matreya

    Joined:
    Nov 14, 2009
    #2
    Well, normally, people would already have all their data backed up to at least a time machine backup...

    I've come across some command-line voodoo that purports to fix a fusion volume, but I would be very wary of following them.

    I also wouldn't trust re-using a defective drive, a new one is a better investment.
     
  3. Fishrrman macrumors G4

    Joined:
    Feb 20, 2009
    #3
    We need more information.

    You wrote above:
    "Apple had replaced a 3TB HD on my iMac"

    Did you buy the iMac with a fusion drive as standard equipment?
    Did you subsequently experience a drive failure?
    Did they put a -fresh- 3tb hard drive into the iMac, and then give you the old drive back?

    I'm thinking that if the iMac came originally with a 3tb fusion drive (which is composed of a 128gb SSD and a 3tb HDD), and if Apple replaced the 3tb HDD, and if "the old one" is what you now "have in your hand" -- that Disk Utility is still "seeing it" as representing "one-half" of a fusion drive and will try to "re-integrate" it with other drives in your Mac.

    If that's the case, you DON'T want Disk Utility to "rebuild the fusion drive".
    You may already have a working fusion drive setup -in- the iMac.

    Again, we need more information.

    Instead, you want to re-initialize the 3tb "drive in your hand" to HFS+ and use it as a "standalone" drive...
     

Share This Page