Operations
6-8 C141-E104-02EN
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).
LS2LS1LS1LS1 LS
63
Physical head 0
Physical cylinder 0
127126646362
LH8LH1LH0
321
Physical sector
LS
63
LS
63
505 506504
LS4LS3 LS
63
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
Physical head 0
Physical cylinder 1
61 62
LH9LH8
21
Physical sector
LS2LS1
Figure 6.5 Address translation (example in CHS mode)