Fujitsu MPB3052AT Manual Do Utilizador

C141-E045-02EN

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).

127

126

64

62 63

3

2

LS1

LS
63

LH4

LH2

LH1

LH0

LS1

1

Physical sector

Physical head 0

ex:  Zone 0

Physical parameter
– Physical sector:  1 to 300
Specification of INITIALIZE DEVICE PARAMETERS command
– Logical head:    LH = 0 to 14
– Logical sector:   LS = 1 to 63

Physical cylinder 0

300

299

LS1

LS
48

LS
47

LS
63

79

78

16

15

LS1

LS
49

LS
63

LH6

LH5

LH4

1

Physical sector

LS2

LS1

LS
63

Physical head 0

Physical cylinder 1