![]() The combined length of all tracks is 10590 mm, so based on the 50 KBit for track 35, the whole disk can hold 269 KB 2, if every track is read and written at its individual speed.Ĭommodore chose to support four speed zones. And if the material on the disk must be able to hold 50 Kbit on track 35, it must be safe to store 70 KBit on track 1. But tracks on the outside are longer: track 1 is 46% longer than track 35. The Shugart format was using the same number of sectors on each track. Like Apple, Commodore bought just the mechanism without the controller (Shugart called this the SA-390), and used its own 6502-based system as the controller (which was cheaper) and defined their own format (which made better use of the disk). The Shugart SA-400 drive, which defined the minifloppy, included a controller that formatted the disk with 90 KB. track capacity: 50 Kbit/track 1 (= 25.4 bytes per millimeter on track 35). ![]() These are the specifications of the original 5¼-inch “minifloppy” from 1976: This article explores different strategies, each with its pros and cons, to fit up to 246 KB. The drive’s operating system fits 170 KB on a disk. ![]() The physical data format on a Commodore 1541 5¼-inch floppy disk as used by the C64 is completely defined in software. ![]()
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