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Tracks | Sectors/track | Sectors/disk | Bytes | Overall Drive Configuration |
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35 | 10 | 340 | 85,680 | 35 track, Single Sided, Single Density |
35 | 20 | 680 | 171,360 | 35 track, Single Sided, Double Density |
35 | 20 | 680 | 171,360 | 35 track, Double Sided, Single Density |
35 | 40 | 1360 | 342,720 | 35 track, Double Sided, Double Density |
40 | 10 | 390 | 98,280 | 40 track, Single Sided, Single Density |
40 | 20 | 780 | 196,560 | 40 track, Single Sided, Double Density |
40 | 20 | 780 | 196,560 | 40 track, Double Sided, Single Density |
40 | 40 | 1560 | 393,120 | 40 track, Double Sided, Double Density |
80 | 10 | 790 | 199,080 | 80 track, Single Sided, Single Density |
80 | 20 | 1580 | 398,160 | 80 track, Single Sided, Double Density |
80 | 20 | 1580 | 398,160 | 80 track, Double Sided, Single Density |
80 | 40 | 3160 | 796,320 | 80 track, Double Sided, Double Density |
If you're paying attention, you may have noticed that the calculations shown here are "short" by one track.
The track that is not counted in these calculations is used in all formats to hold the directory of files for the disk. In unusual cases, there may be enough files on a disk to require more directory space than the first reserved track; in that case, FLEX will automatically add sectors to the directory from the currently unused data sectors. Alternatively, there is a utility provided called "extend" which will reserve a block of sectors if you know ahead of time that you will be placing an unusually large number of files on a disk. Extending a directory this way makes the directory searches run faster on a floppy system; within this emulated system, the file I/o is not noticeably affected by fragmentation.
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