I need to recover data from an old filesystem, which was located on two small (by today's standards) drives -- using a concatenated disk driver (known as ccd in FreeBSD).
I have the drives online (no disk errors) and have already dumped their images.
My problem is, I do not remember the interleave factor I used 10 years ago... How would I recover that? The scan_ffs finds some old superblocks on each image, but those aren't usable until I properly interleave them together again.
Are there any tell-tale signs of ccd, that would help me detect the interleave value I used?
Update: Using some tools I was able "recover" some files from one of the drives -- including MPEG-files, which, predictably, have regular holes in them --
ffplay is doing its best to play them, but complains about lots of errors and the streams constantly stutter.
I think, by measuring the sizes of the holes, I'll be able to figure out the interleave. Can they be measured, though?