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C141-E112-01EN
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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 which is
specified by the INITIALIZE DEVICE PARAMETERS command. The head address is advanced
at the subsequent sector from the last sector of the current physical head address. The first
physical sector of the subsequent physical sector is the consecutive logical sector from the last
sector of the current physical sector.
Figure 6.5 shows an example (assuming there is no track skew).
LS
63
LH2LH1LH0
LS
2
LS
1
LS
1
608607606190189
64636232
23221
1
127126
Physical sector
Physical sector
ex: Zone 0
Physical parameter
- Physical sector: 1 to 608
Specification of INITIALIZE DEVICE PARAMETERS command
- Logical head: LH=0 to 15
- Logical sector: LS=1 to 63
Physical cylinder 0
Physical head 1
Physical cylinder 0
Physical head 0
LS
63
LS
1
LS
63
LS
1
LS
41
LS
40
LS
39
..
..
..
..
..
..
..
..
LS
63
LS
42
LS
1
LS
63
LS
1
LS
63
LS
1
..
..
..
..
..
..
....
..............
..............
LH10LH9 LH11
LH12
86
14885 608607
LH9
Figure 6.5 Address translation (example in CHS mode)