Hardware Reference
In-Depth Information
This drive has a total of 172,676 cylinders, which are divided into 24 zones averaging
7,195 cylinders each. Zone 0 consists of the outermost cylinders, which are the longest
and contain the most sectors (1,920 for each track), whereas the inner zone has only 912
sectors per track.
With zoned recording, this drive averages 1,302 sectors per track. Without zoned record-
ing, the number of sectors per track would be limited to 912 for all tracks. The use of
zoned recording, therefore, provides nearly a 43% increase in the storage capacity of this
particular drive.
Alsonoticethedifferenceinthedatatransferratesforeachofthezones.Becausethedrive
spins at 5,400 rpm, it completes a single revolution every 1/90 of a second, or every 11.1
milliseconds. Therefore, the data transfer speed varies depending on which zone you are
