Preventing a Defective drive from Mounting

Discussion in 'iMac' started by Hexley, Sep 29, 2017.

  1. Hexley macrumors 6502a

    Jun 10, 2009

    I have a late 2012 iMac with Fusion Drive. A year agothe HDD became defective and I was forced to split the Fusion drive between the HDD and SSD. Doing this allowed me to do a fresh install of macOS onto the SSD.

    The problem now is every other boot up macOS detects the defective HDD and tries to mount it. This results in a slower boot time and login.

    macOS would eventually give up and report that I should manually "eject" the defective drive before "unplugging it".

    Now, is there a command where in macOS will not mount the defective HDD at boot?

    I was toying around with installing a 10TB or 12TB HDD to replace the defective 1TB and make a new Fusion Drive but I fear breaking anything more.

    I have the install kit from OWC to replace a drive but I am a bit hesitant.
  2. nambuccaheadsau macrumors 68000


    Oct 19, 2007
    Nambucca Heads Australia
    Do both the PCI-e and platter drive appear in System Preferences > Startup Disc? If so make sure the PCI-e drive is highlighted as the boot drive.
  3. EugW macrumors 603


    Jun 18, 2017
    If the HD is erasable, then erase it. Then...

    Even if the SSD is the only option for Startup Disk, make sure it is highlighted.
  4. Hexley thread starter macrumors 6502a

    Jun 10, 2009
    macOS only sees the SSD. Platter drive isn't seen.
    --- Post Merged, Sep 29, 2017 ---
    Done and done

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