could not determine fs type - fsck

[Christoph Kukulies]

I replaced a disk that had trouble with fsck in a 5.3 system and connected it
to a 5.2.1 system for further examinaton.

starting fsck /dev/ad3 gave me an error: could not determine file system type.

Had there been some change in FS right between FreeBSD 5.2 and 5.3 such that
either systems couldn't recognize each others FSs?
--
Chris Christoph P. U. Kukulies kuku_at_kukulies.org