Hard Disk 20

The Macintosh Hard Disk 20 is the first hard drive developed by Apple Computer specifically for use with the Macintosh 512K. Introduced on September 17, 1985, it was part of Apple's solution toward completing the Macintosh Office (a suite of integrated business hardware & software) announced in January 1985. It would be over a year more before Apple would release the file server software AppleShare that would link all of the hardware together. By that time the SCSI interface introduced on the Macintosh Plus in January 1986, would accommodate far faster and more efficient hard drives, rendering the Hard Disk 20 virtually obsolete.

Hard Disk 20
Connects toMacintosh Plus;
Macintosh 512K via:
  • DB-19 Connector
Design firmApple Inc.
ManufacturerApple Inc.
IntroducedSeptember 17, 1985 (1985-09-17)
DiscontinuedSeptember 1987 (1987-09)
CostUS$1,495 (equivalent to $4,235 in 2023)
TypeHard Disk
Memory20 MB
ConnectionFloppy drive port at 500 kbit/s
Power consumption30 W
Weight7 lbs (3.2 kg)
Dimensions3.1 x 9.7 x 10.5 inches (7.9 x 25 x 27 cm)
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