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6-8 C141-E042-01EN
6.2.2 Logical address
(1) CHS mode
Logical address assignment starts from physical cylinder (PC) 0, physical head
(PH) 0, and physical sector (PS) 1 and is assigned by calculating the number of
sectors per track that is specified by the INITIALIZE DEVICE PARAMETERS
command. If the last sector in a zone of a physical head is used, the track is
switched and the next logical sector is placed in the initial sector in the same zone
of the subsequent physical head.
After the last physical sector of the last physical head is used in the zone, the
subsequent zone is used and logical sectors are assigned from physical head 0 in
the same way.
Figure 6.5 shows an example of 4 heads configuration. (assuming there is no track
skew).
Figure 6.5 Address translation (example in CHS mode)