Once the Terminal application is opened, just type the command 'diskutil list' and press return. ![]() This will display detailed information regarding various disks and volumes in your Mac. But I read through the comments and people commented on one thread saying "force quitting "fsck_ext."" worked and it did! The external drive is corrupt but I was able to mount it and transfer all of the files to a new drive. Why an error may occur when trying to format or partition a HDD or SSD stating that the drive cannot be dismounted or unmounted. From here, please note the identifier of the disk you wish to format (like disk2 or disk1). Especially if the drive does not always show up on your desktop when you attach it. I did some digging and found this video, which didn't work for me. The error youre receiving is likely due to failing hardware. Cannot Unmount Disk Seagate Mac Unable To Unmount Volume For Repair High Sierra Mac Unable To Un Mount Disk Question: Q: Disk Utility cannot unmount disk I am trying to reinstall snow. Restoring the original state found as unmounted. If you consider to verify a non-journaled disc, Disk Power will screen this message: 'ERROR: could not stop volume (Procedure not supported).'. Note: The tutorial and screenshots below are based on an older version of macOS. Disable Put hard disks to sleep when possible. NOTE: Prevent computer from sleeping when display is off may not be avilable for all versions of macOS. Enable Prevent computer from sleeping automatically when display is off. They might be different if your Mac is on a relatively new macOS version. Click on the Apple icon then select System Preferences/System Settings. ![]() or unmount messages if they appear c) after very few minutes the drive was. The quickest way to do this is a simple Spotlight search (click the search icon on the upper right corner), or go to Applications > Utilities > Disk Utility. Performing fsck_hfs -fy -x /dev/rdisk3 File system check exit code is 8. If your external hard drive cant be recognized by your Mac and First Aid. Verifying storage system Performing fsck_cs -n -x -lv -uuid 4AF87A87-C7FD-4602-9219-2AB85A1841EB Checking volume disk2s2: Scan for Volume Headers disk2s2: Scan for Disk Labels Logical Volume Group 4AF87A87-C7FD-4602-9219-2AB85A1841EB on 1 device disk2s2: Scan for Metadata Volume Logical Volume Group has a 24 MB Metadata Volume with double redundancy Start scanning metadata for a valid checkpoint Load and verify Segment Headers Load and verify Checkpoint Payload Load and verify Transaction Segment Incorporate 0 newer non-checkpoint transactions Load and verify Virtual Address Table Load and verify Segment Usage Table Load and verify Metadata Superblock Load and verify Logical Volumes B-Trees Logical Volume Group contains 1 Logical Volume Load and verify FCAA5230-823C-4739-97D0-A74A7EEF6990 Load and verify A0CE9EC2-E381-44A0-9B88-CC37C76C8B41 Load and verify Freespace Summary Load and verify Block Accounting Load and verify Live Virtual Addresses Newest transaction commit checkpoint is valid Load and verify Segment Cleaning The volume 4AF87A87-C7FD-4602-9219-2AB85A1841EB appears to be OK Storage system check exit code is 0. Running First Aid on “Seagate Backup Plus Drive” (disk3) First Aid Test in Disk Utility returned this:
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