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Seagate Cheetah 18LP FC ST318251FC / 9P2004-001 18GB

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Seagate Cheetah 18LP FC ST318251FC / 9P2004-001 18GB 3.5″ FC-AL HDD – Refurbished

Cheetah 18LP FC General Description

CheetahTM 18LP FC drives combine dual stripe magneto resistive (DSMR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo technology, and a Fibre Channel interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.

Cheetah 18LP FC drives are random access storage devices designed to support the Fibre Channel Arbitrated Loop (FC-AL) and SCSI Fibre Channel Protocols. Cheetah 18LP FC drives are classified as intelligent peripherals and provide level 2 conformance (highest level) with the ANSI SCSI-1 standard.

Cheetah 18LP FC drives have the following standard features:

  • Integrated dual port FC-AL controller
  • Concurrent dual port transfers
  • Support for FC arbitrated loop, private and public attachment
  • Differential copper FC drivers and receivers
  • Downloadable firmware using the FC-AL interface
  • Supports SCSI enclosure services via interface connector
  • 128-deep task set (queue)
  • Supports up to 32 initiators
  • Drive selection ID and configuration options are set on the FC-AL backpanel or through interface commands. Jumpers are not used on the drive.
  • Supports SCSI Enclosure Services through the interface connector
  • Fibre Channel worldwide name uniquely identifies the drive and each port
  • User-selectable logical block size (512 to 4,096 bytes per logical block)
  • Selectable frame sizes from 128 to 2,112 bytes
  • Industry standard 3.5-inch low profile form factor dimensions
  • Programmable logical block reallocation scheme
  • Flawed logical block reallocation at format time
  • Programmable auto write and read reallocation
  • Reed-Solomon error correction code
  • Sealed head and disc assembly (HDA)
  • No preventive maintenance or adjustments required
  • Dedicated head landing zone
  • Automatic shipping lock
  • Embedded Grey Code track address to eliminate seek errors
  • Self-diagnostics performed at power on
  • 1:1 interleave
  • Zone bit recording (ZBR)
  • Vertical, horizontal, or top down mounting
  • Dynamic spindle brake
  • 1,024 Kbyte data buffer.
  • Embedded servo design
  • Reallocation of defects on command (Post Format)
  • Fibre Channel interface transports SCSI protocol

Performance

  • Programmable multi-segmentable cache buffer
  • 106 Mbytes/sec maximum instantaneous data transfers per port
  • 10,016 RPM spindle; average latency = 2.99 msec
  • Command queuing of up to 128 commands
  • Background processing of queue
  • Supports start and stop commands
  • Adaptive seek velocity; improved seek performance

Reliability

  • 1,000,000 hour MTBF
  • LSI circuitry
  • Balanced low mass rotary voice coil actuator
  • Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
  • Dithering
SKU: ST318251FC Category: Tags: ,
Weight 0.589 kg
Cheetah 18LP FC Disc Drive
Model Number ST318251FC
Alt Model Number 9P2004-001
INTERNAL DRIVE CHARACTERISTICS
Drive capacity 18.2 GB
Read/write data heads 12
Bytes per track 153,284 -229,045 Bytes (average, rounded off values)
Bytes per surface (total) 1,913 Mbytes (unformatted, rounded off value)
Tracks per surface (total) 9,801 Tracks (user accessible)
Tracks per inch 12,580 TPI
Peaksbits per inch 252 KBPI
Internal data rate 193-300 Mbits/sec (variable with zone)
Disc rotation speed 10,016 rpm (+ 0.5%)
Avg rotation latency 2.99 msec
GENERAL PERFORMANCE CHARACTERISTICS
Data buffer to/from disc media
  • Minimum: 22.7 Mbytes/sec
  • Average: 29.5 Mbytes/sec
  • Maximum: 36.2 MBytes/sec
Fivre Channel Interface maximum instantaneous transfer rate 106 Mbytes/sec per port
Logical block size
  • Default is 512-byte data block
  • Variable 512 to 4,096 bytes per sector in even number bytes per secoter.
Read/write consecutive secotors on a track Yes
Flae reallocation performance impact Negiligible
Overhead time for head switch in sequential mode 0.8 msec
Overhead time for one track cylinder switch in sequetial mode 1.2 msec (typical)
Average rotational latency 2.99 msec
RELIABILITY SPECIFICATIONS
Seek error rate Less than 10 errors in 10^8
Read Error Rates
  • Recovered Data: Less than 10 erros in 10^12 bits transferred
  • Unrecoverd Data: Les than 1 sector in 10^8 bits transferred
  • Miscrrected Data: Less than 1 sector in 10^21 bits transferd
Interface error rates
  • Less than 1 error in 10^12 bits transferred with minimum receive eye
  • Less than 1 error in 10^14 bits transferred with typical receive eye
MTBF 1,000,000 hours
PHYSICAL/ELECTRICAL SPECIFICATIONS
Typical power dissipation under idle conditions 12.1 watts
Maximum wet bulb temperature 82°F (28°C)
Operating Temperature 41°F to 122°F (5°C to 50°C)
Non-operating Temperature –40° to 158°F (–40° to 70°C)
Relative humidity opererating 5% to 95% non-condensing relative humidity with a maximum gradient of 10% per hour
Relative humidity Non-operating 5% to 95% non-condensing relative humidity.)
Effective altitude (sea level) Operating –1,000 to +10,000 feet (–305 to +3,048 meters)
Effective altitude (sea level) Non-operating 82°F (28°C)
Vibration Operating – normal 5-400 Hz @ 0.5 G
Vibration Operating – abnormal 15 minutes of duration at major resonant frequency 5-400 Hz @ 0.75 G (X, Y, or Z axis)
Vibration Non- operating
  • 5-22 Hz @ 0.040 inches (1.02 mm) displacement
  • 22-400 Hz @ 2.00 G
Air cleanliness The drive is designed to operate in a typical office environment with minimal environmental control.
Acoustics Sound power during idle mode shall be 4.3 bels typical when measured to ISO 7779 specification
Height 1.000in/25.4mm
Width 4.000in/101.6mm
Depth 5.75in/146.05mm
Weight 1.3pounds/0.589 kilograms

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