if you have a PC with two 3.5 floppies, you can use adfread, creating adf images of your amiga disks. this works very well with unprotected amiga disks.
in case a track is bad, the program will re-read the bad track(s) on second start. i saved alot of my old amiga disks this way. this can be repeated until the tracks have been reading successfully.
adfread 1.1:
http://www.winuae.de/download/adfread-1.1.zip
a system driver for adfread:
http://simonowen.com/fdrawcmd/