ocr: Macintosh Internal Hard Disk 80SC System Requirements Touse a Macintosh Internal Hard Disk 80SC, you must have a Macintosh SE, Macintosh SE/30, Macintosh II, Macintosh Ilcx, orl Macintosh IIx personal computer. Technical Specifications Capacity Data capacity: 8umegabytes(ormated) Data surfaces: 5 Heads/Surface: 1 Block. size: 512bytes Total disk blocks: 163,940 Blocks/Track: 28: and 35 Characteristics Average seek time: 20 milliseconds Rotational spced: 3,662 rpm Startuptme: 20 seconds Spin-down time: 20: seconds Interface Connects dircctly tot the Macintosh SE, Macintosh SE/30, Macintosh II, ...