2 logical address – FUJITSU MPG3XXXAH-E User Manual
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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
LH2
LH1
LH0
LS
2
LS
1
LS
1
736
735
734
190
189
64
63
62
3
2
21
20
1
1
127
126
Physical sector
Physical sector
ex: Zone 0
Physical parameter
- Physical sector: 1 to 736
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
43
LS
42
LS
41
. .
. .
. .
. .
. .
. .
. .
. .
LS
63
LS
44
LS
1
LS
63
LS
1
LS
63
LS
1
. .
. .
. .
. .
. .
. .
. . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . .
LH12
LH11
LH13
LH14
84
146
83
736
735
LH11
Figure 6.5
Address translation (example in CHS mode)