Atari SH 205 20 MB Hard Disk for ST series

Hard disk, 1986, Atari. The SH204 was the first hard disk for the ST, a 20 MB unit connected to the ACSI DMA port of the computer in a case matching the early ST peripherals; the SH205 is the same drive in the revised case introduced with the Mega ST. Both use a full-height 5.25" mechanism with an ACSI-to-SCSI adapter board and can be daisy-chained on the ACSI bus, which allowed the Mega ST to boot from hard disk with the supplied driver software.