![]() ![]() Apple early investor and executive Mike Markkula asked cofounder Steve Wozniak to design a drive system for the computer after finding that a checkbook-balancing program Markkula had written took too long to load from tape. ![]() This is not the case with Apple's 3 + 1⁄ 2-inch drives, which use several different disk formats and several different interfaces, electronically quite dissimilar even in models using the same connector they are not generally interchangeable.ĭisk II atop an original box for the Apple 5.25 DriveĪpple did not originally offer a disk drive for the Apple II, which used data cassette storage like other microcomputers of the time. The only 5 + 1⁄ 4" drive Apple sold aside from the Disk II family was a 360k MFM unit made to allow Mac IIs and SEs to read PC floppy disks. Most DuoDisk drives, the Disk IIc, the UniDisk 5.25" and the AppleDisk 5.25" even use the same 19-pin D-Sub connector, so they are directly interchangeable. They can all use the same low-level disk format, and are all interchangeable with the use of simple adapters, consisting of no more than two plugs and wires between them. While all of these drives look different, and use four different connector types, they're all electronically extremely similar. ![]() These floppy drives cannot be used with any Macintosh without an Apple IIe Card as doing so will damage the drive or the controller.Īpple produced at least six variants of the basic 5 + 1⁄ 4-inch Disk II concept over the course of the Apple II series' lifetime: The Disk II, the Disk III, the DuoDisk, the Disk IIc, the UniDisk 5.25" and the Apple 5.25 Drive. ![]() The Disk II was designed specifically for use with the Apple II personal computer family to replace the slower cassette tape storage. It went on sale in June 1978 at a retail price of US$495 for pre-order it was later sold for $595 (equivalent to $2,670 in 2022) including the controller card (which can control up to two drives) and cable. The Disk II Floppy Disk Subsystem, often rendered as Disk ][, is a 5 + 1⁄ 4-inch floppy disk drive designed by Steve Wozniak at the recommendation of Mike Markkula, and manufactured by Apple Computer, Inc. ![]()
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