External Drives - Unmounting vs Ejecting

Discussion in 'Mac Basics and Help' started by Reimer, Dec 7, 2014.

  1. Reimer macrumors regular


    Sep 15, 2006
    Can anyone explain the difference?

    I have two USB drives connected to a Macbook Pro. One for Time Machine and the other as a storage drive.

    I put the MBP to sleep every night so I've always ejected the drives beforehand since I've read this is what you're supposed to do in case of issues with sleeping, data loss, etc.

    Or is it enough to just unmount? Both drives are encrypted so I typically have to enter the password every time I unlock them in Disk Utility
  2. Garsun macrumors regular


    Oct 20, 2009
    As far as I know it's all the same for a single partition drive.

    Also as long as you don't physically unplug them during sleep I beleve OS X handles sleeping external drives without issues. Not that I have tried it recently.

    Hopefully someone with a bit more experience will reply with perhaps better advice soon:eek:
  3. The-Pro macrumors 65816

    Dec 2, 2010
    you can leave them connected without problems when you put your computer to sleep. OSX will just make the drives sleep (spin them down) aswell and they will be woken up again when you wake up the computer. there is no chance of loosing any data. I do this daily.
    you only need to eject the drives if you are unplugging the drives from the computer
  4. Fishrrman macrumors G5


    Feb 20, 2009
    If you just want to "unmount" the drives -- that is, remove them from the desktop, but DO NOT actually disconnect them from the computer -- you might try something called Semulov to do this:

    Very handy little app -- resides in right-hand menu bar.
    You can dismount volumes by name, and after the MacBook wakes up, you should be able to RE-mount them, as well.

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