External hard drives won't go to sleep after inactivity

Discussion in 'macOS Mojave (10.14)' started by amoergosum, Aug 15, 2019 at 12:57 AM.

  1. amoergosum macrumors 6502

    Oct 20, 2008
    I'm using a 2019 iMac and macOS Mojave 10.14.6 .

    My external hard drives won't go to sleep anymore after inactivity.

    I checked 'Put hard discs to sleep when possible' in system preferences.

    Does anyone else have this issue? What can I do about it?
  2. Fishrrman macrumors P6


    Feb 20, 2009
    You could do what I do:
    If I'm not going to be using the drive for a good while (for hours or even days) -- I just disconnect it.

    That works 100% of the time... ;)
  3. MSastre, Aug 15, 2019 at 11:51 AM
    Last edited: Aug 15, 2019 at 11:56 AM

    MSastre macrumors 6502a


    Aug 18, 2014
    I don't remember that working for external drives .. key words "when possible". Like Fishrrman, I always unmount and turn them off manually. I don't want my drives to shut off automatically because of working with video.
  4. DeltaMac macrumors G3


    Jul 30, 2003
    I'm pretty sure that "feature" is dependent on the external drive interface - the enclosure or cable that connects to the hard drive. Some manufacturers provide that function, others do not.
  5. mikzn macrumors 65816


    Sep 2, 2013
    Some apps can prevent the drive from "sleeping" if they are open and if they check on files that are on that drive

    I used to use a script for a "One Click" desktop option to un-mount and re-mount some drives that were permanently connected and would spin all the time, but I gave up on that and now just unplug the drives when not needed

    Some of them are back up drives and CCC gives me an alert when it cannot find the drive, and I reconnect them as needed
  6. fisherking macrumors 604


    Jul 16, 2010
    ny somewhere
    some drives (g-tech, for example), seem to never sleep; my seagate drives do sleep...

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5 August 15, 2019