On 2021-05-20 4:01 p.m., Warner Losh via cctalk wrote: > On Thu, May 20, 2021 at 1:56 PM Antonio Carlini via cctalk < > cctalk@classiccmp.org> wrote: > >> I'm running Linux Mint (an ubuntu derivative) and I want to mount ULTRIX >> CDROM discs to see what I can see. >> >> (I'm eventually going to image these, but I presume that will "just >> work" with dd or ddrescue). >> >> They are supposed to be UFS format (according to the net) and that >> usually means you have to tell mount exactly which option to use (as not >> all UFS implementations are compatible). >> >> I've tried (all the options I can find) and failed: >> >> $ sudo mount -t ufs -o ufstype=44bsd /dev/sr1 /tmp/mount > > 44bsd is likely too new. ufstype=old or =sunos or =sun might work.
Setting ufstype=sun will indeed work for loopback mounting Ultrix CD images. With physical CDs, the Linux CD-ROM driver expects the filesystem to use 2048 byte blocks but the UFS CDs have 512 byte blocks. So you'll also have to add "loop" to the options: sudo mount -t ufs -o ro,ufstype=sun,loop /dev/sr1 /tmp/mount That will mount the physical CD using a loopback device so you can access the 512 byte per block filesystem. (FWIW, I learned that trick with IRIX EFS CDs, which have the same problem.)