![]() Macinto9e3bfb3c:~ howardhonig$ diskutil listĢ: Apple_HFS Macintosh HD 999.3 GB disk0s2ģ: Apple_Boot Recovery HD 650. Thanks.Įxample of what I've tried in Terminal. I've tried to unmount the entire disk as well as the individual partitions. Design 70 thoughts on Fix for disk erase failed couldnt unmount disk Randall says: July 14. ![]() I've tried to unmount through disk utility as well as through Terminal. Error: Time Machine could not complete the backup. Disk Utility states the disk needs to be repaired, but when I try to repair the disk, "unable to unmount for repair" is stated. Finally, disconnect a disk member which you want to unmount. Choose View and choose Show All Devices at the upper left of this app. Go to Launchpad, find Other, and then launch Disk Utility. To do First Aid again, follow these steps. If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon. One of the most tried and tested solutions is to repair this disk one more time. In the second step, go to the toolbar there and click on Unmount button. In the Disk Utility app on your Mac, select the APFS volume you want to erase in the sidebar. I can see the drive in Finder, but some times the folders appear to be empty of files, and sometimes I can see the files but cannot access. In order to force your Mac to unmount disk, follow the below steps: On your Mac PC, go to the Disk Utility, choose a disk set that you wish to unmount. Along the same lines, if you want to remount a drive you can usually just physically unplug the drive and plug it back again. I cannot transfer files to/from this hard drive anymore, and Time Machine will no longer work. For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one of the force eject methods. I have a 2010 iMac with a 1.5 TB Seagate external hard drive I use for Time Machine as well as other backups. I'm having a problem unmounting an external hard drive. I know this conversation seems to be close, but thought I'd try to post here. You have to be able to rely on your backups otherwise they're worthless. I strongly recommend not using it for backing up or anything else. 4 Ways to Fix Couldnt Unmount Disk/Volume for Repair Error on Mac Click on the Spotlight icon from the menu bar. Especially if the drive does not always show up on your desktop when you attach it. If you used Disk Utility from macOS Recovery, you can now restart your Mac: choose Apple menu > Restart.Hello. The error you're receiving is likely due to failing hardware. When I go to Time Machine to switch drives, it asks me if I want to erase, I click 'erase' (totally fine because its brand new and has nothing on it yet), and then it pops up with a window that says 'there was an error preparing the Time Machine backup disk, couldnt unmount disk'. The order of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4, then APPLE SSD. Keep moving up the list, running First Aid for each volume on the disk, then each container on the disk, then finally the disk itself. If you're asked for a password to unlock the disk, enter your administrator password.Īfter Disk Utility is done checking the volume, select the next item above it in the sidebar, then run First Aid again. ![]() If the button is dimmed and you can't click it, skip this step for the disk, container, or volume you selected.drive from Terminal on your Mac diskutil unmount /Volumes/Time Machine. If there is no Run button, click the Repair Disk button instead. Disk utility tip: Fix couldnt unmount disk errors 1) Once booted from OS X.the error message states that it will not unmount 1 year ago 93 1 Time Machine can't unmount new external HD to initiate backups Just got a WD My Book to replace my old external HD for Time Machine backups. If youre using a Time Capsule as your backup disk, use AirPort Utility to. ![]() In this example, the last volume on the disk is Macintosh HD - Data.Ĭlick Run to begin checking the selected volume for errors. time machine will not unmount I am trying to run First Aid to recover 4TB of drive space from a previous Time Machine backup. This could mean that your server is offline, or Nginx isnt working properly. For each disk that you're repairing, start by selecting the last volume on that disk, then click the First Aid button or tab.
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