Hard Disk 20SC

The Apple Hard Disk 20SC is Apple's first SCSI based hard drive for the Apple II family as well as the Macintosh and other third party computers using an industry standard SCSI interface.

Not to be confused with Hard Disk 20.

Hard Disk 20SC
Model number: M2604
Connects toMacintosh Plus;
Macintosh SE;
Macintosh II via:
  • Direct Connection

Apple IIe;
Apple IIGS via:

  • Apple IIGS
Design firmApple Inc.
ManufacturerApple Inc.
IntroducedSeptember 1986 (1986-09)
Discontinued1989
CostUS$1,299 (equivalent to $3,610 in 2023)
TypeHard Disk
Memory20 MB
ConnectionDirect
Ports50-pin SCSI x2
Power consumption60 W
Weight8 lb (3.6 kg)
Dimensions3.1 x 9.7 x 10.5 (inches)
78 x 246 x 266 (mm)
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