Logical Address - Fujitsu MHM2100AT - Mobile 10 GB Hard Drive Product Manual

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
Physical cylinder 0
LS1
Physical head 0
Physical sector
1
Physical cylinder 1
LS3
Physical head 0
ex: Zone 0 in 6-head device
Physical parameter
– Physical head:
– Physical sector: 1 to 506
Specification of INITIALIZE DEVICE PARAMETERS command
– Logical head:
– Logical sector: 1 to 63
Figure 6.5 Address translation (example in CHS mode)
6-8
2 3 62 63
LS
63
LH0
2 61 62
LS
LS4 LS1
63
LH8
0 to 5
0 to 15
64 126 127
LS
LS1
63
LH1
LS2
LH9
504 505 506
LS
LS1 LS2
63
LH8
C141-E104-03EN