if there was only one partion with FAT, you#re out of luck with any standard tool because the fat is within the first 10 mb.
the are tools out there (google something like 'file recovery FAT'), but I don't know whether such exist for OpenBSD: In any case, the more fragmented the FAT was, the less is the chance of reviving something meaningful.
Seriously. Recovering messed up file systems is not something you can do if you don't know how to do it. You can't learn it when you need it nownownow. And noone will do it for you unless you pay them. ibas are the best. And reading the source to mount_msdos won't help you a bit since it doesn't do much more than setup some trivial arguments and call mount(2).
Thank you for your replies. I was not clear enough in the first place: due to the first 10Mb being gone, I do not expect to find any valid fs anymore. What I still hope for are individual files from the 3Gb image file that I have. I mean e.g. exe's, or dll's, zip's, lha's etc should have their size written in them or their data structures, not only fs, as well. So that e.g. for exe's I would find their "MZ" beginning chars, size after them and seek until the end by the size. Its gonna be time consuming, I know. That is why I asked in the first place. I dared to ask about it on misc@ because I thought that mount_msdos might be more helpful in this case. Thank you so much for the time.
