Data Format

Track skew

Head

Track skew

Head skew

Head

Leadinglogical

sector inhead p+1

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.

3.1.4Sector 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

 

 

 

 

 

 

 

 

SCT

PLO

SM1

DATA1

SM2

DATA2

BCRC

ECC

PAD

 

 

 

G1 Sync

 

G2

 

 

 

SCT

Servo

PLO

SM1

DATA1

SM2

DATA3

PAD G2

G1 Sync

SCT

PLO

SM1 DATA1 SM2 DATA4 BCRC ECC PAD G3

G1 Sync

Figure 3.6 Sector format

3-6

C141-E219

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Fujitsu MAV2073RC, MAV2036RC manual Track skew/head skew, Sector format