On Thu, May 20, 2021 at 04:11:18PM -0400, John-Paul Stewart via cctalk wrote: > 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.)
Wow! I never expected to learn something new about mounting CDs tonight :-) Thanks! -- Malte Dehling <mdehling at gmail.com>
