Sector Format; Figure 3.5 Track Skew/Head Skew; Figure 3.6 Sector Format - Fujitsu MBA3073NC - Enterprise 73.5 GB Hard Drive Product Manual

Head
Head
3.1.4
SCT
PLO
G1 Sync
SCT
PLO
Sync
G1
36
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Track skew
Track skew
Figure 3.5
The number of physical sectors (track skew factor and head skew factor) corresponding to the
skew time varies depending on the logical data block length because the track skew and the head
skew are managed for individual sectors. The HDD automatically determines appropriate values
for the track skew factor and the head skew factor according to the specified logical data block
length.

Sector format

Each sector on the track consists of an ID field, a data field, and a gap field which separates them.
Figure 3.6 gives sector format examples.
SM1 DATA1 SM2 DATA2
SM1 DATA1 SM2 DATA3 PAD G2
Each sector on the track consists of the following fields:
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Track skew/head skew
SCT
BCRC ECC
PAD
G2
Servo
PLO
SM1
G1 Sync
Figure 3.6 Sector format
Head skew
Leading logical
sector in head p+1
DATA1 SM2 DATA4 BCRC ECC
C141-E270
SCT
PAD
G3