Drive
FileWare drives are 5¼-inch double-sided, but are not mechanically compatible with industry-standard diskettes. In a single-sided floppy disk drive, the disk head is opposed by a foam pressure pad. In a normal double-sided floppy disk drive, the top and bottom heads are almost directly opposed to each other. Apple was concerned about head wear, and instead designed the FileWare drive such that the top and bottom heads are on opposite sides of the spindle, and each is opposed by a pressure pad. Since there is only one actuator to move the heads, when one head is near the spindle, the other is near the outer rim of the disk.
The drive is approximately the same size as a standard full-height 5¼ inch floppy drive, but does not use the standard mounting hole locations. The electrical interface is completely different than that of standard drives, though conceptually similar to that of the Disk II.
Read more about this topic: Apple File Ware
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—Jeremy Larner, U.S. screenwriter, and Michael Ritchie. David (Chris Prey)