Can't see external drives in Startup Manager

Discussion in 'macOS Mojave (10.14)' started by jjfelix, Jul 25, 2019.

  1. jjfelix macrumors newbie

    Joined:
    Feb 16, 2019
    #1
    My MacBook Pro 13" Mid-2012 running OSX 10.11.6 is not displaying externally connected disks in Startup Manager.

    I have a brand new Crucial SSD cloned from a different machine, that I would like to boot from.

    I know the SSD is fine as i've tested it externally with another almost identical MacBook pro (except running OSX 10.14.3) and have no problems getting it to boot.

    I also know the USB ports on the machine are fine, as once logged in I can see other USB devices and hard drives in Finder, but NOT the Crucial SSD (although it is visible in Disk Utility). However, I can't see these other USB devices and hard drives in Startup Manager.

    The Crucial SSD doesn't work when trying to boot it internally either.

    I have tried resetting the NVRAM and SMC.

    Below are screenshots from Disk Utility on the original MacBook (OSX 10.11.6), and then then working MacBook (OSX 10.14.3).

    Screen Shot 2019-07-25 at 06.44.17.png

    Screenshot 2019-07-25 at 14.43.01.png

    Is it perhaps something to do with how the Crucial SSD is formatted?
     
  2. CoastalOR macrumors 68020

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #2
    I want to clarify if by "Startup Manager" you are referring to using the Option key during bootup?

    I will say that El Capitan (10.11.x) will not be able to properly see bootable drives using the new APFS format (Mojave).
     
  3. jjfelix thread starter macrumors newbie

    Joined:
    Feb 16, 2019
    #3
    Yes that is correct.

    To clarify also - the Crucial SSD has OSX 10.13 installed on it. Will this be incompatible with the OSX installed on the MacBook (10.11)?
     
  4. jbarley macrumors 68040

    jbarley

    Joined:
    Jul 1, 2006
    Location:
    Vancouver Island
    #4
    El-Capitan (10.11.6) cannot handle APFS volumes, a quick search comes up with links such as this...
    https://discussions.apple.com/thread/8171271

    if I have misunderstood your problem, just ignore this post.:)
    a quote from the link above tells it all...
    "By itself, El Capitan regards your APFS drive as a paperweight"
     
  5. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #5
    If the Crucial SSD is formatted for APFS, the Mac with El Capitan won't "see it" at all.

    Like it "wasn't even there".
     
  6. CoastalOR macrumors 68020

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #6
    Wow, the first post said nothing about 10.13, only 10.11 & 10.14. Regardless, 10.13 can be formatted as APFS. If that is the format on the Crucial, then 10.11 will not be able to properly see it.
     
  7. jbarley macrumors 68040

    jbarley

    Joined:
    Jul 1, 2006
    Location:
    Vancouver Island
    #7
    Your 2nd photo shows an external drive APFS, if that is the drive in question then all the info above about El-Capitan not seeing APFS drives applies, period!
     

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6 July 25, 2019