Why are my external HDs ejecting themselves?

Discussion in 'Mac Pro' started by Reality4711, Jan 21, 2010.

  1. Reality4711 macrumors 6502


    Aug 8, 2009
    Hello all,

    I run a MacPro 3.2Octo on SL..

    Two external HDs connected. firstly/ usb(original) is my Time machine and secondly/800FW (original) is my ITunes library.

    When my machine goes to sleep - either itself or on demand - on awakening one or both HDs have ejected themselves and the error message is displayed.

    Sometimes they re-connect but not always.

    Is there some setup I have missed (energy setting - put HDs to sleep when possible is not ticked) or another glitch I am unaware of.

    Apologies if this is old stuff. References to previous solutions would be just as helpful.

    Thank you.
  2. Corrosive vinyl macrumors 6502

    Corrosive vinyl

    Sep 22, 2006
    What happens when the Mac goes to sleep (not just into idle mode or display sleep)?

    On all Macs:

    The microprocessor goes into a low-power mode
    Video output is turned off, and a connected display may turn off as well, or enter its own idle state
    Apple-supplied hard disks spin down; third-party hard disks may spin down
    On portable Macs:

    The Ethernet port turns off, if applicable (see note below)
    Expansion card slots turn off
    The built-in modem, if present, turns off (see note below)
    An AirPort card, if present, turns off (see note below)
    The USB connection only responds to the power key on an external keyboard (see below)
    The optical media drive spins down
    Audio input and output turns off
    Keyboard illumination, if a feature of your portable computer, turns off

    Apple Support site
  3. Reality4711 thread starter macrumors 6502


    Aug 8, 2009
    Thank you.

    It is when the Mac fully goes to sleep that the ejection occurs.

    The seeming randomness is the frustration. It does not seem to have any logic to it.

    It was not a problem on my G5 or using Leopard on this machine.

    I have read your references (scanned) but am unable to see this referenced - it all seems to be what should happen rather than what if it doesn't :)

    Thank you again.

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