Operations

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 that is specified by the INITIALIZE DEVICE PARAMETERS command. If the last sector of a physical track is used, the track is switched and the next logical sector is placed in the initial sector of the subsequent physical track.

Figure 6.5 shows an example of 6 heads configuration. (assuming there is no track skew).

Physical sector 1 2 3

Physical cylinder 0

62

63

64

 

126

127

 

504

505

506

 

 

 

 

 

 

 

 

 

 

 

 

Physical head 0

LS1

LH0

LS

LS

LS1

 

LS LS1 LS2

63

 

63

 

63

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LH1

 

 

 

LH8

Physical sector

Physical cylinder 1

1

2

 

 

 

61

62

 

 

 

 

 

 

 

LS3

LS4

 

 

 

 

LS

LS1LS2

 

Physical head 0

 

 

 

 

 

 

 

 

 

 

 

63

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LH8

 

 

 

LH9

ex: Zone 0 in 6-head device

Physical parameter

Physical head: 0 to 5

Physical sector: 1 to 506

Specification of INITIALIZE DEVICE PARAMETERS command

Logical head: 0 to 15

Logical sector: 1 to 63

Figure 6.5 Address translation (example in CHS mode)

6-8

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Fujitsu MHL2300AT, MHM200AT, MHM2100AT, MHM215OAT manual Logical address, Address translation example in CHS mode

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