Dual HDD - mid 2012 13-inch

Discussion in 'Mac Basics and Help' started by karimbomba, Oct 1, 2016.

  1. karimbomba macrumors newbie

    Oct 1, 2016
    I just replaced the cd-rom with a hdd caddy, and am running macos sierra.
    unfortunately i can't seem to find the hard drive within the os.
  2. ApolloBoy macrumors 6502a


    Apr 16, 2015
    San Jose, CA
    Did you format the drive first? You have to format it from Disk Utility first before macOS recognizes it.
  3. MacEMT macrumors newbie

    Oct 2, 2016
    If that isn't the problem, it may be your hard drive placement. What type of hard drives are you using, solid state or hard disk? Which one is in the caddy? Which one is the boot disk?
    I had a problem like this with a 500GB SSD as the boot drive and a 2TB HDD in the caddy. The 2TB would stop being seen after a few minutes of inactivity (I think because of the power draw and the way Mac handles power to the ODD). I switched the disks, putting the 500GB SDD boot drive in the caddy, and no ones complained since.

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