Logical Address; Address Translation (Example In Chs Mode) - Fujitsu MPE3XXXAE 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 8
LH10
ex: Zone 0
Physical parameter
- Physical sector: 1 to 574 (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
56 57 119 120 182
. . . .
. .
LS LS LS LS
63 1 63 1
. . . .
. .
LH11 LH12

Address translation (example in CHS mode)

C141-E093-01EN
126 127 189 190 574
. . . .
LS LS LS LS LS
63 1 63 1
. . . .
LH2
183
. . . . . . . . . . . . . .
LS LS
63 1
. . . . . . . . . . . . . .
. . . .
LH13
575 576
SP SP
7
575 576
SP SP
6 - 7