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I have an external SSD I've used for a while with no issue. I've recently been using it on my iPad on the go, also with no issue. When I wanted to use it on a Mac today (after using it on my iPad for a while), the disk wouldn't mount anymore. Still does on the iPad for some reason. Tested on MacOS 12.2 & 12.2.1 Any ideas as to how this can happen ? Here's what Disk Utility's First Aid tells me: Running First Aid on “ExtSSD” (disk8s1) Checking file system and repairing if necessary and if possible. Volume is already unmounted. Performing fsck_apfs -y -x /dev/rdisk8s1 Checking the container superblock. error: (oid 0x14e776) om: invalid o_oid (0x71ff) error: (oid 0x14e776) om: invalid o_type (0x3, expected 0x4000000b) error: (oid 0x14e776) om: invalid o_type (0x3, expected 0x4000000b) error: verification/reading of the omap object failed: Illegal byte sequence warning: checkpoint 192 (xid 26927) failed consistency check Checking the space manager. error: spaceman cib out of order: 0, expected 2 Space manager is invalid. The volume /dev/rdisk8s1 could not be verified completely. File system check exit code is 8. Restoring the original state found as unmounted. File system verify or repair failed. : (-69845) Operation failed… Or directly Via CLI: ❯ sudo fsck_apfs /dev/rdisk8s1 ** Checking the container superblock. error: (oid 0x14e776) om: invalid o_oid (0x71ff) error: (oid 0x14e776) om: invalid o_type (0x3, expected 0x4000000b) error: (oid 0x14e776) om: invalid o_type (0x3, expected 0x4000000b) error: verification/reading of the omap object failed: Illegal byte sequence warning: checkpoint 192 (xid 26927) failed consistency check Checking the checkpoint with transaction ID 26926. ** Checking the space manager. error: spaceman cib out of order: 0, expected 2 Space manager is invalid. ** The volume /dev/rdisk8s1 could not be verified completely.