* Any data can exist in Gap 2 and will not affect reading of the ID fields or sectors.
* Any data can exist in Gap 3 and will not affect reading of the ID fields or sectors.
* The first sector on ID of the track will not be seen when using READ DATA if the ID field "index gap" is less than 896 microseconds from the index pulseor less. (TODO: Find exact value because 896 is within 4 MFM words).