Making a bootable USB "Mount of outer dmg failed"

Discussion in 'OS X El Capitan (10.11)' started by Macs4u, Aug 2, 2015.

  1. Macs4u macrumors 6502

    Apr 19, 2008
    Stoke on Trent

    Currently running Yosemite and trying to create a bootable USB drive for El Capitan so i can put a clean install on. It keeps throwing up the Mount of outer dmg failed" at the end. Ive tried everything i can think of to rectify it but can't.

    Could i create another partition, install El Capitan on that an then delete Yosemite's partition when I'm in El Capitan?

  2. MrNomNoms macrumors 65816

    Jan 25, 2011
    Wellington, New Zealand
    I had the same issue however I did an upgrade to El Capitan then I created a bootable USB drive in El Capitan and the error didn't occur so I'm unsure why it happened.
  3. tywebb13 macrumors 68020

    Apr 21, 2012

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