I have a DR-LS-120 drive and it seems to be very picky about which floppies it will read. Sometimes it will just keep spinning the disk, never stop, and never show me a file list. The 2 120meg disks run fine, but the good old floppy seems sporadic. Anyone else have this problem??
I have an LS-120 (Digital Research) and it seems to digest all manner of floppies I give it. I would reformat your floppies, especially if they are the cheap generic ones. Format them in the LS-120 for better formatting (it is after all a laser-servo device!) Good luck.