We have some data on very old DDS (1,2 and 3) DAT tapes. I tried reading them with:
dd if=/dev/st0 of=file bs=32k
but get many partial blocks and sometimes IO errors. Have also tried with:
dd if=/dev/st0 of=file bs=32k conv=noerror
which does not stop at partial blocks but does sometimes give IO errors. Some of these tapes contain tar archives but most of them contain a bunch of FITS files. What would be the best way to rescue as much data as possible from these tapes?