APFS volume won't mount in 10.12.2

Question

I have an external harddrive with an APFS partition. The partition mounts under 10.12.1 without issue, but will not mount in 10.12.2 dev beta 1.

$ diskutil apfs -IHaveBeenWarnedThatAPFSIsPreReleaseAndThatIMayLoseData list

======================================================================================================
ENUMERATION OF ALL CURRENT APFS OBJECTS
   apfs call: sizeForContainer: err=-69808="Some information was unavailable during an internal lookup"
   apfs call: freeSpaceForContainer: err=-69808="Some information was unavailable during an internal lookup"
|
|-- APFS CONTAINER REFERENCE = disk2s6
---------------------------------------------------------------------

fsck_apfs

can't deal with it either.

$ sudo fsck_apfs disk2s6
** Checking volume.
** Checking the container superblock.
error: nx_incompatible_features has unsupported flags: (0x1)
   Container superblock is invalid.
** The volume disk2s6 could not be verified completely.

I don't see anything in the release notes indicating a disk format change. Anyone know if this is a bug, a known change, or just local to my volume?

Beta
macOS

2.6k

Posted by

meissnem

Reply

Add a Comment

Answer 1

I received a belated follow-up to the Radar I submitted for this. Apple confirmed that a change in 10.12.2 Developer Beta 5 caused this issue and it was expected. Reformat and carry on is the correct course of action.

Posted by

meissnem

Add a Comment

Answer 2

I am seeing exactly the same problem with an external drive. Same information from disktuil and same error message from fsck_apfs, so this is not just local to your volume.

Posted by

simes.at.barca

Add a Comment

Answer 3

Same issue for me. Started with 10.12.1 beta. I recreated the volume (in 10.12.2) and it seems to be working fine. Obviously, the disclaimer about losing all your data on APFS drives cannot be overstated enough.

Posted by

MoscowOnDarlinghurst

Add a Comment

Answer 4

Yes, I ended up doing the same thing (recreated the volume in 10.12.3) and it seems to work fine.

Posted by

simes.at.barca

Add a Comment

Answer 5

I received a belated follow-up to the Radar I submitted for this. Apple confirmed that a change in 10.12.2 Developer Beta 5 caused this issue and it was expected. Reformat and carry on is the correct course of action.

Posted by

meissnem

Add a Comment

APFS volume won't mount in 10.12.2

Accepted Reply

Replies