Fujitsu C141-E090-02EN, Product Manual

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C141-E090-01EN 6 - 7
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
506 505 504 190 189
64 63 62 3 2
64 63 1
1
127 126
Physical sector
Physical sector
ex: Zone 0
Physical parameter
- Physical sector: 1 to 504 (For the rest, 2 spare sectors)
Specification of INITIALIZE DEVICE PARAMETERS command
- Logical head: LH=0 to 14
- 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
SP SP LS
63
. .
. .
. .
. .
. .
. .
. .
. .
LS
63
LS
1
LS
1
LS
63
LS
1
LS
63
LS
1
SP SP
. .
. .
. .
. .
. .
. .
. . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . .
LH9 LH8 LH10
LH11
127 189 126 506 505
Figure 6.5 Address translation (example in CHS mode)