Fujitsu MAH3091MC - Enterprise 9.1 GB Hard Drive, Maintenance Manual

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C141-E103-01EN 3 - 7
(2) Track skew and cylinder skew
To avoid waiting for one turn involved in head and cylinder switching, the first logical data block
in each track is shifted by the number of sectors (track skew and cylinder skew) corresponding to
the switching time. Figure 3.5 shows how the data block is allocated in each track.
At the head switching location in a cylinder, the first logical data block in track t + 1 is allocated at
the sector position which locates the track skew behind the sector position of the last logical data
block sector in track t.
At the cylinder switching location, like the head switching location, the first logical data block in a
cylinder is allocated at the sector position which locates the cylinder skew behind the last logical
sector position in the preceding cylinder. The last logical sector in the cylinder is allocated when
formatting, and is an unused spare sector.
Figure 3.5 Track skew/cylinder skew
The number of physical sectors (track skew factor and cylinder skew factor) corresponding to the
skew time varies depending on the logical data block length because the track skew and the
cylinder skew are managed for individual sectors. The IDD automatically determines appropriate
values for the track skew factor and the cylinder 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.