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User Manual

ManualsBrandsSeagate Bulk ManualsSeagate Bulk Hard Drives & Storage4TB ENT CAP 3.5 HDD SATA 7200 RPM 128MB 3.5IN
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SCSI Commands Reference Manual, Rev. J 411
www.seagate.com Parameters for direct access devices
ALTERNATE SECTORS PER ZONE field
The ALTERNATE SECTORS PER ZONE field indicates the number of spare sectors to be reserved for the defined defect management zone. A
value of zero indicates that no sectors are to be reserved in each zone for defect management. This is to accommodate hosts that want to man
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age the defects themselves.
ALTERNATE TRACKS PER ZONE field
The ALTERNATE TRACKS PER ZONE field indicates the number of spare tracks to be reserved at the end of each defect management zone. A
value of zero indicates that no spare tracks are to be reserved in each zone for defect management by the drive.
ALTERNATE TRACKS PER VOLUME field
The ALTERNATE TRACKS PER VOLUME field indicates the number of spare tracks to be reserved at the end of the drive volume. The drive uses
these locations for replacing defective sectors. A value of zero 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. However, it is not changeable on some products.
SECTORS PER TRACK field
The SECTORS PER TRACK field indicates the average number of physical sectors the drive has per disk 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.
DATA BYTES PER PHYSICAL SECTOR field
The DATA BYTES PER PHYSICAL SECTOR field indicates the number of data bytes the drive shall allocate 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.
INTERLEAVE field
The INTERLEAVE field is not supported on Seagate products.
TRACK SKEW FACTOR field
The TRACK SKEW FACTOR field indicates 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 a SCSI initiator port.
CYLINDER SKEW FACTOR field
The CYLINDER SKEW FACTOR field indicates 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 drive but is not changeable by a SCSI ini
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tiator port.