![]() ![]() Only the ROM program on the Disk II controller card needed to be changed to make the move to DOS 3.3. The remarkable thing about this upgrade was that the disk drives themselves did not need to be changed to make this possible. This resulted in a disk that could now hold a maximum of 140K of data (124K excluding DOS and the catalog track), a 23 percent increase over the 13 sector disks. Changing slightly the method used for encoding data on the disk made it possible to have 16 sectors per track, instead of the original 13 sectors per track in DOS 3.1 and 3.2. Steve Wozniak, the author of the original DOS disk driver ( RWTS), had found a way to increase the storage capacity of Apple floppy disks. Since it was designed to have DOS present on each disk in the first three tracks, and the catalog took up another entire track, there was actually only 100.75K available for data storage. At 256 bytes possible per sector, this made the disk capable of holding 113.75K of information. ![]() The original disk drive had been designed with the ability to read and write 35 tracks of 13 sectors each on a 5.25 inch disk. It consisted of not only a new System Master disk, but a hardware upgrade chip as well. In August of 1980, Apple released an upgrade for DOS, to version 3.3. ![]()
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