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Fibre Channel Interface Manual, Rev. D 225
Sectors Per Track
The average number of physical sectors the disc drive has per disc track. This value depends on the selected sector size
and ZBR zones. The number of user accessible sectors per track may be fewer than the reported value, since sectors per
track includes sectors set aside for defect management. This value cannot be used to calculate drive user-accessible
capacity.
Note. The value cannot be directly selected with the Mode Select command, but is a report of how the drive is config-
ured.
SURF (Surface)
0 The target allocates progressive addresses to all logical blocks within a cylinder prior to allocating addresses on the
next cylinder
1 The target allocates progressive addresses to all logical blocks on a surface prior to allocating sector addresses on
the next surface.
Track Skew Factor
The average number of physical sectors between the last logical block on one track and the first logical block on the next
sequential track of the same cylinder. A value of zero indicates no skew.
Note. This value is not changeable by an initiator.
Tracks Per Zone
The number of tracks the disc drive allocates to each defect management zone. Seagate drives define a defect manage-
ment zone as one track or one cylinder. A programmed value of 1 defines one track per zone (i.e. spare sectors per track).
Any other recorded value results in the drive defining one cylinder as the defect management zone and the drive automati-
cally inserts the number of read/write heads (i.e., number of tracks per cylinder) in this field. Default value is usually 1, but
see individual drive’s Product Manual, Volume 1.
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