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8
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 capacities:
Formatted [1]
Data Block Size
512 Byte/Sector
4.550 GB [2]
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. User
available capacity depends on spare reallocation scheme selected. See Mode Select Command and For-
mat Command in the SCSI Interface Product Manual , P/N 77738479.
[2]
Formatted with a regional sparing scheme. Each region contains 12 cylinders. Each region has 108 spare
sectors.
3.6
Programmable drive capacity
Using the Mode Select command, the drive can change its capacity to something less than maximum. See
Table 5.2.1-13 in the SCSI Interface Product Manual , P/N 77738479, Rev. G or later. 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
cannot 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 greater than the maximum number of LBAs is rounded down to the maximum capacity.
3.7
Factory installed accessories
OEM standard drives are shipped with the Cheetah 4LP Installation Guide , P/N 83329110 (unless otherwise
specified). The factory also ships with the drive a small bag of the two jumper plug types used for the J5, J6,
and J2 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.
• Black plastic front panel. Other panel colors may be special-ordered. Panel has a green, rectangular LED
drive activity indicator lens. The indicator glows when the drive is selected.
• 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 Cheetah 4LP Installation Guide , P/N 83329110 is usually included with each standard OEM drive
shipped, but extra copies may be ordered.
• 2 Mbyte cache memory option. Standard cache memory is 442 Kbytes.
• Level 2 SCAM compliance.
3.9
Accessories (user installed)
The following accessories are available. All accessories may be installed in the field.
• Front panel kit (with green rectangular LED lens), P/N 73497151
• Single-unit shipping pack
• Cheetah 4LP Installation Guide , P/N 83329110
Unformatted
5.591 GB
Cheetah 4LP Product Manual, Rev. B
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