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C141-E035-03EN3 - 6
3.1.3 Track format
(1) Physical sector allocation
Figure 3.4 shows the allocation of the physical sectors in a track. The length in bytes of each
physical sector and the number of sectors per track vary depending on the logical data block
length. The unused area (G4) exists at the end of the track in formats with most logical data
block lengths.
The interval of the sector pulse (length of the physical sector) is decided by multiple of
15MHz free running frequency. This clock is not equal to the interval of the byte clock for
each zone. Therefore, the physical sector length cannot be described with a byte length.
Figure 3.4 Track format