Safely mount OS X UFS filesystem?

Thor Lancelot Simon tls at
Sat Jul 7 02:56:55 UTC 2007

Can I, on a system running FreeBSD 6.2 or -current, safely mount a
UFS filesystem created (and used) on Mac OS 10.4.10?  These filesystems
are UFS1 (at fslevel 3) with big-endian datastructures in the metadata,
4k blocks and 1k fragments, and a few minor oddities in their layout;
they are pretty much exactly the UFS NeXT used on their workstations.

If so, Will such a filesystem be safe to mount under OS X after I use it
on FreeBSD?

I seem to be able to mount these under NetBSD though the snapshot code
complains that inodes 64 and 16384 are not dedicated to snapshots.

  Thor Lancelot Simon	                                       tls at

  "The inconsistency is startling, though admittedly, if consistency is to
   be abandoned or transcended, there is no problem."	      - Noam Chomsky

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