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cant unmount external drive

248 Views 2 Replies Latest reply: Feb 17, 2013 9:23 AM by Noah Wallach RSS
Noah Wallach Level 2 Level 2 (290 points)
Currently Being Moderated
Feb 10, 2013 10:16 AM

Hi there,


I use super duper to back up my system drive to an external drive.  I quit super duper and about a minute later the external drive light is lit red meaning the drive is busy.  I am not able to unmount or eject this drive.   The error is "An error occurred while trying to eject '<$drive_name>'"


What can I do to cleanly unmount my external drive?




  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    Feb 10, 2013 3:05 PM (in response to Noah Wallach)

    Typically this sort of question is better answered on Superduper forums, as it's their software.


    I suspect Spotlight is indexing the external drive, why it's busy and can't be unmounted.


    So head to System Preference Spotlight and turn off indexing except for the boot drive, also change the name of the clone as OS X gets confused if there are two drives with the same name.


    If after rebooting you can't unmount the drive, try this


    Drive won't "unmount". First check for Spotlight or open programs using the drive/volume, reboot.

    >>>Force unmounting launch Terminal type diskutil list and press enter/return for a list of devices.

    >>>Take the Identifier and add here for disks: diskutil unmountDisk force Identifier and press enter/return.


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