Can't install El Cap in external usb 3 drive

Discussion in 'OS X El Capitan (10.11)' started by MetalMac, Jul 29, 2015.

  1. MetalMac macrumors member


    Nov 11, 2007
    Tijuana, MEX
    So I decided to test the Cap on my external usb 3 enclosure. Downloaded the first public beta from the App Store, double clicked, selected the partition (GPT HFS+) restart. Now when the installer boots up, theres nothing writing or reading my external, and after not even a minute it unmounts, only option for install is my Yosemite installation. I even ran a diskutil verify on terminal just to see if I could keep it busy, and it actually unmounted midway, so I decided not to try that with the installation.

    Couple of things to note:
    -There was no USB tab in system information in the OS X install.
    -A week ago I installed El Cap to a usb 2.0 stick, no problems ( just painfully slow)
    -On this same external enclosure I have 2 other partitions, one is for Time Machine the other for stuff I dont want in the TM, no filevault.
    -The external works fine in Yosemite, stays mounted even if disk spins down.
    -This is the first public beta installer, should I download the latest? Does the installer use actual beta drivers and maybe theres a buggy one for usb 3 ???
  2. Shirasaki macrumors 604


    May 16, 2015
    El Capitan has serious issue for USB devices.

    I would even want to install a full mac OS X on an USB drive to take it on the go and install any OS X newer than El Capitan.
  3. Ebenezum macrumors 6502a

    Mar 31, 2015
    Surprising, I didn't have any problems installing Public Beta 1 on a external USB3 drive.

    I did notice problems with USB devices after installation, maybe latest Beta 3 solves them?

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