Logical Address; Address Translation (Example In Chs Mode) - Fujitsu MPG3XXXAH-E 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
Physical head 1 44
LH11
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
Figure 6.5
2 3 62 63 64
. . . .
LS LS LS
2 63 1
. . . .
LH0 LH1
20 21 83 84 146
. . . .
. .
LS LS LS LS
63 1 63 1
. . . .
. .
LH12 LH13

Address translation (example in CHS mode)

C141-E116-01EN
126 127 189 190 734
. . . .
LS LS LS LS LS
63 1 63 1 41
. . . .
LH2
. . . . . . . . . . . . . .
LS LS
63 1
. . . . . . . . . . . . . .
. . . .
LH14
735 736
LS LS
42 43
LH11
735 736
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