Seagate Barracuda 18XL ST318416N, Product Manual

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8 Barracuda 18XL Product Manual, Rev. A
3.5 Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes per
sector. The following table shows the standard OEM model read capacities data. Total LBAs = read capacity
data shown below +1.
Notes.
[1] Sector size selectable at format time. Users having the necessary equipment may modify the data block
size before issuing a format command and obtain different formatted capacities than those listed. See
Mode Select command and Format command in the SCSI Interface Product Manual, part number
75789509.
[2] User available capacity depends on spare reallocation scheme selected. The number of data tracks per
sparing zone and the number of alternate sectors (LBAs) per sparing zone can be determined by using
the Mode Sense command and reading Mode Page 03h. Total LBAs(h) x 200(h) = total byte capacity.
3.6 Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See the
Mode Select Parameter List table in the SCSI Interface Product Manual, part number 75789509. Refer to the
Parameter list block descriptor number of blocks field. A value of zero in the number of blocks field indicates
that the drive shall not change the capacity it is currently formatted to have. A number in the number of blocks
field that is less than the maximum number of LBAs changes the total drive capacity to the value in the block
descriptor number of blocks field. A value of FF FF FF FF in the number of blocks field restores the drive
capacity to the maximum capacity.
3.7 Factory installed accessories
OEM Standard drives are shipped with the Barracuda 18XL Installation Guide, part number 75789511, and the
Safety and Regulatory Agency Specification, part number 75789512, (unless otherwise specified). The factory
also ships with the drive a small bag of jumper plugs used for the J2, J5, and J6 option select jumper headers.
3.8 Options (factory installed)
All customer requested options are incorporated during production or packaged at the manufacturing facility
before shipping. Some of the options available are (not an exhaustive list of possible options):
• Other capacities can be ordered depending on sparing scheme and sector size requested.
• 4 Mbyte optional buffer size.
• Single unit shipping pack. The drive is normally shipped in bulk packaging to provide maximum protection
against transit damage. Units shipped individually require additional protection as provided by the single unit
shipping pack. Users planning single unit distribution should specify this option.
• The Barracuda 18XL Installation Guide, part number 75789511, and the Safety and Regulatory Agency
Specification, part number 75789512, are included with each standard OEM drive shipped, but extra copies
may be ordered.
3.9 Accessories (user installed)
The following accessories are available.
• Single unit shipping pack.
Formatted data block size
512 bytes/sector [1] [2]
ST318436 35,885,168 (223906Fh) (18.373 GB)
ST318426 35,885,168 (223906Fh) (18.373 GB)
ST318416 35,885,168 (223906Fh) (18.373 GB)
ST39236 17,942,584 (111C837h) (9.186 GB)
ST39226 17,942,584 (111C837h) (9.186 GB)
ST39216 17,942,584 (111C837h) (9.186 GB)