Fujitsu MPG3XXXAT Manuale Utente

C141-E110-02EN

6 - 7

(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

798

797

796

190

189

64

63

62

3

2

34

33

1

1

127

126

Physical sector

Physical sector

ex: Zone 0

Physical parameter
     - Physical sector:  1 to 798 (For the rest, 2 spare sectors)
Specification of INITIALIZE DEVICE PARAMETERS command
     - Logical head:    LH=0 to 15
     - 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

LS

30

LS

29

LS

28

. .

. .

. .

. .

. .

. .

. .

. .

LS

63

LS

31

LS

  1

LS

63

LS

  1

LS

63

LS

  1

LS

  1

LS

63

. .

. .

. .

. .

. .

. .

. .

. .

. . . .

. . . .

. . . .

LH14

LH13

LH15

LH16

LH1

97

160

159

96

223

222

798

797