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C141-E110-02EN
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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
798797796190189
64636232
34331
1
127126
Physical sector
Physical sector
ex: Zone 0
Physical parameter
- Physical sector: 1 to 798 (For the rest, 2 spare sectors)
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
30
LS
29
LS
28
..
..
..
..
..
..
..
..
LS
63
LS
31
LS
1
LS
63
LS
1
LS
63
LS
1
LS
1
LS
63
..
..
..
..
..
..
..
..
....
....
....
LH14LH13 LH15 LH16
LH1
97
16015996 223222 798797
Figure 6.5 Address translation (example in CHS mode)