1.^This rule is true at least for all formats where the physical sectors are named 1 upwards. However, there are a few odd floppy formats (e.g., the 640 سابقة ثنائية format used by BBC Master 512 with DOS Plus 2.1), where the first sector in a track is named "0" not "1".
2.^While computers begin counting at 0, DOS would begin counting at 1. In order to do this, DOS would add a 1 to the head count before displaying it on the screen. However, instead of converting the 8-bit unsigned integer to a larger size (such as a 16-bit integer) first, DOS just added the 1. This would طفح عدد صحيح a head count of 255 (0xFF) into 0 (0x100 & 0xFF = 0x00) instead of the 256 that would be expected. This was fixed with DOS 8, but by then, it had become a حكم الأمر الواقع standard to not use a head value of 255.
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