![]() ![]() Instead of storing 8–10 sectors (each holding 256 bytes of data) per track on a 5.25-inch floppy disk (something standard at that time), Wozniak utilized group-coded recording (GCR), and with 5-and-3 encoding he managed to squeeze as many as 13 sectors on each track using the same mechanics and the same storage medium. Wozniak's design became the highly successful Disk II floppy drive and controller card, which contained a greatly reduced number of electronic components. ![]() Ī 1983 controller card that was simplified by the IWM chip. Rather than use the existing floppy drives from Shugart Associates, Wozniak decided to use only the drive mechanism, but develop his own electronics and controller for the drive. When first developing a floppy drive for the Apple II, Apple Computer co-founder Steve Wozniak felt that the models available on the market were too complicated, expensive, and inefficient. The first Disk II interface card, released in 1978 for the Apple II. ![]()
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