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Elite 23 Product Manual, Rev. A
• Dynamic spindle brake
• Active IC terminators enabled by jumper ("N" and "W" models only)
• 2,000 Kbyte data buffer. See Section 4.5
• SCAM (SCSI Configured Auto Magically) Plug-n-Play Level 1 compliant. SCAM Level 2 is a factory-installed
option.
3.2
Media characteristics
The media used on the drive has a diameter of approximately 5.25 inches (134 mm). The aluminum substrate
is coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durabil-
ity and environmental protection.
3.3
Performance
• Supports industry-standard Fast-20 SCSI interface (also called "Ultra SCSI")
• Programmable multi-segmentable cache buffer
• 5,400 RPM spindle; average latency = 5.55 msec
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Low audible noise for office environment
• Low power consumption
3.4
Reliability
• 800,000 hour MTBF
• LSI circuitry
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.)
• Incorporates Seek To Improve Reliability algorithm (STIR)
• Dithering algorithm
• 5-year warranty
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 standard OEM model capacities:
ST423451
Notes.
[1]
Standard OEM models are formatted to have 512-byte sectors. 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 real-
location scheme selected. See Mode Select Command and Format Command in the SCSI Interface Prod-
uct Manual, part number 77738479.
[2]
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.
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 , part number 77738479. 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 greater than the maximum number of LBAs is rounded down to the maximum capacity.
Formatted [1]
Unformatted
23.2 Gbytes [2]
29.4 Gbytes
7
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