![]() ![]() I then unplugged the cable and plugged it back in. I then went to Finder and did an Eject, though I'm sure I could have done that manually. ![]() The command First Aid ran is fsck_hfs -fy -x /dev/disk2s2 It runs with a -fy -x rather than just -y. I noticed that First Aid runs fsck but with different options than what was running automatically. Then in the Disk Utility I selected external disk drive and ran First Aid.Īfter First Aid completed, about 2 hours later I was able to Mount the disk through Disk Utility. That stopped the fsck that had made the disk busy. In terminal I ran - ps aux | grep fsck followed by sudo pkill -f fsck The reason it was busy was that fsck ran as soon as I plugged the disk in. I tried the various fixes suggested to do it manually in Terminal. For example, you may encounter Formatting failed (Cannot unmount disk) or. Had the same issue and have been fighting it for days. Format to HTFS+ file system if you want to access the drive from a Mac OS. SD cards are just not reliable - I deal with hundreds of them for work & theyre just not worth the effort once they start to fail. If it still wont unmount/format, throw it away. Note the identifier for the disk you want to unmount. If you want to preserve the volume as opposed to erase the drive, here are steps. 101 1 4 If it wont unmount, reboot the Mac. How to unmount a disk in Terminal Go to Applications > Utilities and launch Terminal, or choose it from the Utilities menu in macOS Utilities in Recovery. (Drive originally formatted/used on an High Sierra Mac.) Also tried an iMac which refused to mount it. Starting with Vista you need to manually unmount the hard disk to successfully write to it, or in other words: make sure the disk you edit has no mounted file. Even though a card serves as storing data, its purpose may change according to your need. I've done all of the above several times.Īny ideas for untrashing this 2TB Seagate drive? Using a MacBook Pro with High Sierra. Possible Reasons for SanDisk SD Card Not Formatting Your SanDisk micro SD card cannot be formatted, which you often use in your Android, digital cameras, and other devices due to file system corruption. When I try to reboot, the desktop icons disappear, the reboot never finishes and I end up forcing a shutdown via the power button. in apple Every computer has a basic structure that dictates how it operates and a backup system in case something fails. resulted in "Unmount of disk2 failed: at least one volume could not be unmounted." which resulted in an error that it was already unmounted or "has a partitioning scheme so use 'disk util unmountDisk' instead" which resulted in an error -69888: Couldn't unmount disk. ![]() Sudo diskutil eraseDisk JHFS+ Reformat /dev/disk2 Disk Utility failed to unmount the Data partition and reported the TM partition was OK, but I can't eject either without issues: Trying to reformat a drive that was used for an employee's Time Machine and Data storage. If you see an error message telling you that macOS couldn’t unmount a disk, it usually means that a process on your Mac is trying to modify your boot disk and can’t because macOS won’t allow the disk that it has booted from to be unmounted. ![]()
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