Logical Address; Address Translation (Example In Chs Mode) - Fujitsu MPD3XXXAT 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 29
ex: Zone 0
Physical parameter
- Physical sector: 1 to 406 (For the rest, 2 spare sectors)
Specification of INITIALIZE DEVICE PARAMETERS command
- Logical head: LH=0 to 14
- Logical sector: LS=1 to 63
Figure 6.5
2 3 62 63 64
. . . .
LS LS LS
2 63 1
. . . .
LH0 LH1
35 36 98 99
. . . .
. .
LS LS LS LS
63 1 63 1
. . . .
. .
LH6 LH7 LH8

Address translation (example in CHS mode)

C141-E069-02EN
126 127 189 190 406
. . . .
LS LS LS LS LS
63 1 63 1 28
. . . .
LH2
161 162 224 225
. .
. . . .
LS LS LS LS
63 1 63 1
. . . . . .
. . . .
LH9
LH10
407 408
SP SP
407 408
SP SP
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