Product manual

Barracuda 18LP FC Product Manual, Rev. B 7
• Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
• Dithering
3.5 Unformatted and formatted capacities
Formatted capacity depends on the spare reallocation sectors scheme selected, the number of data tracks per
sparing zone, and the number of alternate sectors (LBAs) per sparing zone. The following table shows the
standard OEM model read capacity data. Total LBAs = read capacity data shown below + 1.
Standard OEM models are formatted to 512 bytes per block. You can order other capacities by requesting a dif-
ferent sparing scheme and logical block size.
The sector size is 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.
ST318275FC and ST39175FC drives use a zone sparing scheme. The drive is divided into frequency zones
with a variable number of spares in each zone.
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 (6) parameter list table in the Fibre Channel Interface Manual, part number 7767496. A value of
zero in the Number of Blocks field indicates that the drive will not change the capacity it is currently formatted
to have. A number other than zero and less than the maximum number of LBAs in the Number of Blocks field
changes the total drive capacity to the value in the Number of Blocks field. To restore the drive to maximum
capacity, enter a value of FFFFFFFF in the Number of Blocks field.
3.7 Factory-installed accessories
OEM standard drives are shipped with the Barracuda 18LP FC Installation Guide (part number 77767542).
3.8 Factory-installed options
You may order the following items which are incorporated at the manufacturing facility during production or
packaged 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.
• 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 18LP FC Installation Guide, part number 77767542, is usually included with each standard
OEM drive shipped, but extra copies may be ordered.
3.9 User-installed accessories
The following accessories are available. All kits may be installed in the field.
• Evaluation kit, part number 73473641.
This kit provides an adapter card (“T- c a r d ”) to allow cable connections for two FC ports and DC power. Two
twin axial cables, 6 feet in length, are included for the input and output connections to the FC interface.
• Single-unit shipping pack.
Formatted Unformatted
ST39175FC 10F59C7h blocks (9.1 Gbytes with 512 bytes per block) 10.8 Gbytes
ST318275FC 21EB38Fh blocks (18.21 Gbytes with 512 bytes per block) 21.6 Gbytes