repeated fsck_ffs error

[Thomas Mueller]

I accidentally hit the Reset button when trying to push the DVD drive tray button, a finger error easy to make on the NZXT Zero2 (now superseded by newer models) case.

When rebooting, file system checks repaired root partition successfully, but I was unable to mount the desired home partition.

My command was
fsck_ffs -y /dev/gpt/Sea1-06

I ran it repeatedly (first without -y) and seemed to get partial fix, was able to mount read-only and rsync to another directory on another partition.

Latter part of message that came repeatedly, so there was no point in running fsck any more:

CYLINDER GROUP 356: BAD MAGIC NUMBER
REBUILD CYLINDER GROUP? yes

CYLINDER GROUP 357: BAD MAGIC NUMBER
REBUILD CYLINDER GROUP? yes

CYLINDER GROUP 358: BAD MAGIC NUMBER
REBUILD CYLINDER GROUP? yes

CYLINDER GROUP 359: BAD MAGIC NUMBER
REBUILD CYLINDER GROUP? yes

** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
UNREF FILE  I=3  OWNER=root MODE=100000
SIZE=67108864 MTIME=Jun 24 04:22 2014 
RECONNECT? yes

NO lost+found DIRECTORY
CREATE? yes

CYLINDER GROUP 0: BAD MAGIC NUMBER
REBUILD CYLINDER GROUP? yes

fsck_ffs: bad inode number 0 to ginode


Now what is that last line about bad inode number 0 to ginode, and is there any way around?

Do I need to reformat and rsync back?

I can also boot my NetBSD installation from last June (current, 6.99.44 amd64) and run NetBSD's fsck_ffs from there.

Even if that really messes up, I still have the rsync copy to rsync back from.

Tom