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Difference between Apple DuoDisk and Disk II?
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No differences in track-to-track or sector access I know of. But the mechanics are entirely different. Spiral groove in disk vs band pulley. Electronics are substantially the same. Maybe more noise-free because "newer" and more shielding. Also has optical write protect notch detection, so you must use black or opaque tape to activate WP.
The original Disk II is a Shugart mechanism, forget what the newer one is made. Both are quite reliable in the end.
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No differences in track-to-track or sector access I know of. But the mechanics are entirely different. Spiral groove in disk vs band pulley. Electronics are substantially the same. Maybe more noise-free because "newer" and more shielding. Also has optical write protect notch detection, so you must use black or opaque tape to activate WP.
The original Disk II is a Shugart mechanism, forget what the newer one is made. Both are quite reliable in the end.