We have a usb memory stick that FreeBSD-11 will not mount because its file system is not clean. It is not clean because it was removed from an extension cable while it was mounted on a FreeBSD-11 system. However, there was no file activity that we are aware of at the time it was removed.
We cannot get fsck or fsck_ffs to find a superblock so these will not run. Even when we provide fsck_ffs -b with a superblock address found using newfs -N it does not consider the block location as a superblock.
How do we clear the dirty bit so that we can mount the device?
This problem was repaired with:
fsck.ext3 /dev/da0s1