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?

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    What filesystem is the flash drive? UFS? Ext*? Other? – Brennen Smith Feb 28 at 20:28
  • file system is linux-data – James B. Byrne Mar 1 at 22:19
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    ^ That's a partition ID, not a filesystem. – Spooler Mar 1 at 22:34

This problem was repaired with: fsck.ext3 /dev/da0s1

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