USB drive not recognised unless disconnected/reconneted

Discussion in 'MacBook Pro' started by mrochester, May 8, 2016.

  1. mrochester macrumors 65816

    Feb 8, 2009
    Hi all

    I've found that if I plug a USB drive into my MacBook Pro while it is asleep or just waking from sleep, OSX will not detect the drive until I unplug and reconnect it again.

    Does anyone know what the problem is and why the drive doesn't just appear?

    Many thanks

  2. Fishrrman macrumors G4


    Feb 20, 2009
    Probably because when the Mac is asleep, or in the process of "waking from sleep", the USB controller isn't "ready" to recognize newly-connected drives yet.

    Wait until the Mac is "fully waked up" and then plug in the drive...
  3. mrochester thread starter macrumors 65816

    Feb 8, 2009
    Bummer. It's only mildly irritating and thought there might be a way to fix it.

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