AMSDOS is the disk operating system for the Amstrad computers. It allows the computer to handle two 178k single-sided drives. It does not features directories, but instead uses user numbers, from 0 to 15 (and up to 255 with a trick) The disk are 9 sectors and 40 tracks.
BASDOS
BASDOS (BASIC Disc Operating System) is an AMSDOS clone made in East Germany (GDR) for the KC Compact.