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Field definitions (listed alphabetically)
Table
number
Alternate Sectors Per Zone
149
The number of spare sectors to be reserved for the defined defect management zone.
0
No sectors are to be reserved in each zone for defect management. This is to accommodate hosts that want to
manage the defects themselves.
Alternate Tracks Per Volume
149
The number of spare tracks to be reserved at the end of the drive volume. The disc drive uses these locations for replacing
defective sectors.
Typically the disc drive defaults to two times the number of read/write heads in the drive, which amounts to two spare cylin-
ders. A value of zero (0) indicates that no spare tracks are to be reserved at the end of the unit for defect management. The
initiator may change this value for a number between 0 and 255 that is a multiple of the total number of Data Read/Write
heads installed.
Alternate Tracks Per Zone
149
The number of spare tracks to be reserved at the end of each defect management zone.
0
No spare tracks are to be reserved in each zone for defect management by the disc drive.
Cylinder Skew Factor
149
The average number of physical sectors between the last logical block of one cylinder and the first logical block of the next
cylinder. A value of zero indicates no skew. Cylinder skew will be utilized by a disc drive but is not changeable by an initia-
tor.
Data Bytes Per Physical Sector
149
The number of data bytes the disc drive allocates per physical sector. This value equals the block length reported in the
Mode Sense block descriptor. The bytes per physical sector is not directly changeable by the initiator and is not verified on
a Mode Select command.
Drive Type
149
The Hard Sectoring (HSEC) bit (bit 6) set to one indicates the disc drive uses hard sector formatting.
The Soft Sectoring (SSEC) bit (bit 7) when set to one indicates the drive uses soft sectoring.
Bits 0–5, and 7 are not implemented by the disc drive and are always zero. Bits 0 – 7 are not changeable.
Interleave
149
The interleave value sent to the disc drive during the last Format Unit command.
This field is valid only for Mode Sense commands. The disc drive ignores this field during Mode Select com-
Note.
mands.
Page Code
149
03h
Format Parameters page code.
Page Length
149
16h
The length of the Format Parameters page (in bytes).
PS (Parameter Savable)
149
This bit is not used with the Mode Select command.
1
The page 03h parameter data is savable.
RMB (Removable)
149
0
Indicates that the logical unit supports removable media.
1
Indicates that the logical unit does not support removable media.
The status of this bit is reflected in the Inquiry command, removable media bit (RMB).
224
Fibre Channel Interface Manual, Rev. D
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