Offset Meaning
0 Sector size
4 Gap 1 side 0
8 Gap 1 side 1
C Gap 3
10 Sectors per track
11 Density
12 Options
13 Start sector on a track
14 Sector interleave
15 Side/side sector skew (signed)
16 Track/track sector skew (signed)
17 Sector fill value
18 Number of tracks to format (ie cylinders/drive: usually 80)
1C-23 Reserved, must be 0
24 sector id buffer, 1 word/sector
bits 0-7 Cylinder number mod 256
8-15 Head (0 onwards)
16-23 Sector number
24-31 log2(sector size)-7
Format options
bit meaning
0 index mark required
1 double step
2-3 0 = interleaved side
1 = format side 1 only
2 = format side 2 only
3 = sequenced sides
4-7 reserved, must be 0
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