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External Hard Drive - Apple HD20, 1985 Object Reg. No: HT 13386

Summary:
Apple HD20 is an external hard drive.

This device provided 20 megabytes of external data storage. Although developed by Apple specifically for use with the Macintosh 512k, this HD20 was used by the donor with his 128k Macintosh, for which additional memory was required. Connection was made via a floppy disk port, and it ran at the same speed as a floppy disk - slowly. It could store the equivalent of 50 400k floppy disks . It could be daisy-chained to a further Apple HD20 or external floppy disk drive.

The HD20 was rendered redundant by the introduction of the SCSI (pronounced 'scuzzy') interface on the Macintosh Plus in 1986, which supported faster data transfer.

This item is part of a representative collection of hardware, software, trade literature and promotional material that documents the history of the Apple company, and its contribution to, and impact on the computer industry and society.
Description:
Rectangular beige plastic box with small coloured Apple company logo at front and vents along the sides and at the rear.
Acquisition Information:
Donation from Bill Jamieson, 2006
Discipline: Technology
Dimensions: 80 mm (Height), 246 mm (Width)
Dimension Comment: Length of cord: 430

More information

Tagged with: computer hard disk drives, computer hard disks, computer hardware, computer peripherals, computer storage devices, computers, computing, geronimo, cheetah
Themes this item is part of: Internet Macintosh User Group (iMug) Collection, Information & Communication Collection
Primary Classification: COMPUTING & CALCULATING
Secondary Classification: Digital Computing
Tertiary Classification: storage & media
Inscriptions: On underside: Macintosh Hard Disk 20 / Apple Computer Inc / Cuperinino CA 95014 / Model Number: M0135
Manufacturer: Apple Computer Inc, Cupertino, California, United States of America, 1985

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