Track Format; Alternate Cylinder - Fujitsu MAH3091MC - Enterprise 9.1 GB Hard Drive Product/Maintenance Manual

The user space and the CE space share the alternate cylinders.
Note:
Zero cannot be specified for both the number of spare sectors in each cylinder and the number
of alternate cylinders.
3.1.3

Track format

(1) Physical sector allocation
Figure 3.4 shows the allocation of the physical sectors in a track. The length in bytes of each
physical sector and the number of sectors per track vary depending on the logical data block
length. The unused area (G4) exists at the end of the track in formats with most logical data block
lengths.
The interval of the sector pulse (length of the physical sector) is decided by multiple of 20MHz
free running frequency. This clock is not equal to the interval of the byte clock for each zone.
Therefore, the physical sector length cannot be described with a byte length.
3 - 6
Figure 3.3

Alternate cylinder

J
Figure 3.4

Track format

C141-E103-02EN