I can confirm that AnaDisk completely bypasses the BIOS and accesses the FDC hardware directly. So if AnaDisk "sees" the drive, your drive and cable are good, but this won't detect misaligned or worn heads. If an AnaDisk "scan" of the floppy reads all the sectors, your drive heads and floppy are good too. In Europe, we had three types of 5 1/4" double-sided drive: 360k, 720k and 1.2M.