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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.
The 20SC originally contained a half height 5.25" Seagate ST-225N 20MB SCSI hard drive, but was later manufactured with a full-height 3.5" MiniScribe 8425SA 20MB SCSI hard drive. The latter drive was the same size as the drive inside the Macintosh Hard Disk 20, but 10 to 15 MB over what had previously been offered by Apple for the II family.
The Macintosh External Disk Drive is the original model in a series of external 3 + 1 ... Designed as a universal external drive replacement, the Apple 3.5 Drive was ...
The Macintosh 512K enhanced (512Ke) was introduced in April 1986 as a cheaper alternative to the top-of-the-line Macintosh Plus, which had debuted three months previously. [2] It is the same as the Macintosh 512K but with the 800K disk drive and 128K of ROM used in the Macintosh Plus. Like its predecessors, it has little room for expansion.
This drive replaced the Apple ]['s Shugart drive and the 871K FileWare/"Twiggy" floppy drive used in the original Lisa as the storage medium chosen for the original Macintosh. The single-sided 3.5-inch floppy stored 400 KB by spinning the disk slower when the outer edge was used.
The Classic features several improvements over the Macintosh Plus, which it replaced as Apple's low-end Mac computer: it is up to 25 percent faster than the Plus, [1] about as fast as the SE, [5] and includes an Apple SuperDrive 3.5" floppy disk drive as standard. [19] The SuperDrive can read and write to Macintosh, MS-DOS, OS/2, and ProDOS ...