![]() ![]() While the disks were single-sided, users often punched an extra notch on the opposite side to permit the disks to be flipped over for use of the other side (the notch was necessary to prevent the disk from being seen by the drive as write-protected). ![]() Some other filesystems also used with this format were ProDOS file system (also used as the Apple III SOS file system) and CP/M file system. Three tracks of the disk were taken up by the DOS software (on bootable disks), and one more track with the catalog (directory) for the Apple DOS file system, leaving 124K for file storage. A ROM upgrade was necessary for older disk drives to support the new format. It was a 5.25" disk (single-sided, soft-sectored, meaning that the index hole was ignored in finding sector locations) with 35 tracks each containing 16 sectors, storing 256 bytes of data in each sector for a total of 143,360 bytes (140K), using GCR encoding (of a type known as "6 and 2", which stored data more efficiently than the "5 and 3" format used in the earlier 13-sector disks 6 and 2 encoding would continue to be used in later Apple disk formats) to store the data. The Apple II 16 sector disk was the floppy-disk format for the Apple II computer line starting with DOS 3.3, superseding the Apple II 13 sector disk used in DOS 3.2.1 and earlier.
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