FUJITSU MAT3147NC/NP - Manual (Page 40)

3-6 C141-E201
Head
Track skew
Track skew
Head skew
Leading logical
sector in head p+1
Head
Figure 3.5 Track skew/head skew
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 IDD automatically determines appropriate values
for the track skew factor and the head skew factor according to the specified logical data block
length. The value can be read out by the MODE SENSE or MODE SENSE EXTENDED
command after the track has been formatted.
3.1.4 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.
SCT
PAD SM1
PLO
Sync
G1
SCT
G2
DATA1 SM2 BCRC DATA2 ECC
SCT
PAD SM1
PLO
Sync
G1
SCT
G3 DATA1 SM2 DATA3 PAD G2
SM1
PLO
Sync
G1
DATA1 SM2 DATA4
Servo
BCRC ECC
Figure 3.6 Sector format
Each sector on the track consists of the following fields: