![]() ![]() What causes the 'Couldn't Unmount Volume' error? ![]() Usually, the error 'Couldn't Unmount Disk' shows up when you try to format, partition, verify or repair internal disk by Disk Utility on Mac system.Unmounting a disk means disconnecting a disk drive or optical disk from the computer.To know about the solutions, first, let's understand about unmounting and disk utility, and the causes of the disk error. Part 1- What does "couldn't unmount disk" mean? Part 4 - Learn, "How to Use Disk Utility?".Part 3 - Recover lost files on Mac after all methods fail.Part 2 - 4 methods to fix "Couldn't Unmount Disk" on Mac.Part 1 - What does' couldn't unmount disk mean?.I also tried resetting PRAM/NVRAM and the SMC per AppleCare's advice, but I doubt this has anything to do with my APFS volumes. I have tried running Disk First Aid multiple times from Recovery and Internet Recovery, booted into Single User Mode and tried to run fsck_apfs -y from there, all to no avail. This is on the new "Data" volume that Catalina creates for your files, aside from the read only system volume. Restoring the original state found as mounted. ![]() ![]() The volume /dev/rdisk2s1 could not be verified completely. The volume iMac HD - Data was formatted by hfs_convert (945.200.129) and last modified by apfs_kext (1412.61.1).Ĭhecking snapshot 1 of 3 (.9458b)Įrror: btn: invalid key order (6) oid 463237 / oxid 0 / level 0 / flags 0x2 Performing fsck_apfs -n -l -x /dev/rdisk2s1Ĭhecking the space manager free queue trees. Verifying the startup volume will cause this computer to stop responding. On the latest version of macOS Catalina as of this writing (10.15.2), Disk Utility is reporting that I have invalid key order on my snapshots: Running First Aid on “iMac HD - Data” (disk2s1) ![]()
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