A report on Group coded recording and Durango F-85

The F-85 used single-sided 5¼-inch 100 tpi diskette drives providing 480 KB utilizing a high-density 4/5 group coded encoding.

- Durango F-85

The Durango Systems F-85 (introduced in September 1978 ) used single-sided 5¼-inch 100 tpi diskette drives providing 480 KB utilizing a proprietary high-density 4/5 group coded encoding.

- Group coded recording

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