I have some disks that were being used on a Solaris system. The disks are formatted as UFS. I attached them to a Debian system (with FreeBSD kernel. Debian/kFreeBSD), but I cannot mount them.

$ mount -t ufs /dev/da2s1 /mnt/diska
mount: /dev/da2s1 : Invalid argument

Also the tunefs.ufs does not work;

$ tunefs.ufs -p /dev/da2s1
tunefs.ufs: /dev/da2s1: could not read superblock to fill out disk

Is there an incompatibility between FreeBSD UFS and Solaris UFS? Is it possible to mount one, under the other OS ?

Note: tunefs.ufs works on the root partition

$ tunefs.ufs -p /dev/da7s2
tunefs.ufs: ACLs: (-a)                                         disabled
tunefs.ufs: MAC multilabel: (-l)                               disabled
tunefs.ufs: soft updates: (-n)                                 disabled
tunefs.ufs: gjournal: (-J)                                     disabled
tunefs.ufs: maximum blocks per file in a cylinder group: (-e)  2048
tunefs.ufs: average file size: (-f)                            16384
tunefs.ufs: average number of files in a directory: (-s)       64
tunefs.ufs: minimum percentage of free space: (-m)             8%
tunefs.ufs: optimization preference: (-o)                      time
tunefs.ufs: volume label: (-L)