Logical Address; Address Translation (Example In Chs Mode) - Fujitsu MPG3XXXAH Product Manual

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).
Physical sector
1
Physical cylinder 0
LS
1
Physical head 0
Physical sector
1
Physical cylinder 0
LS
42
Physical head 1
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
Figure 6.5
2 3 62 63 64
. . . .
LS LS LS
2 63 1
. . . .
LH0 LH1
86
. . 22 23 . . 85
. .
LS LS LS LS
63 1 63 1
. . . .
. .
LH9 LH10 LH11

Address translation (example in CHS mode)

C141-E112-01EN
126 127 189 190 606
. . . .
LS LS LS LS LS
63 1 63 1 39
. . . .
LH2
148
. . . . . . . . . . . . . .
LS LS
63 1
. . . . . . . . . . . . . .
. . . .
LH12
607 608
LS LS
40 41
LH9
607 608
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