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C141-E034-02EN 6 - 7
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 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
62
LS
60
LS
63
LS1 LS2
LS1
250249127126646362321
ex: Zone 0
Physical parameter
– Physical sector: 1 to 250
Specification of INITIALIZE DEVICE PARAMETERS command
– Logical head: LH = 0 to 15
– Logical sector: LS = 1 to 63
Physical sector
Physical sector
LH5LH3 LH4
LH3LH2LH1LH0
LS1
LS1
LS
63
LS
63
LS
63
P
hysical head 0
P
hysical cylinder 0
P
hysical head 0
P
hysical cylinder 1
LS1
656421
Figure 6.5 Address translation (example in CHS mode)