DYSK TWARDY FIBRE CHANNEL

Seagate 18GB Fibre Channel
ST318304FC

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Description:

CheetahTM 36LP FC drives combine giant magnetoresistive (GMR) 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.

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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. Fibre Channel worldwide name uniquely identifies the drive and each port User-selectable logical block size (512 to 704 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 4,096 Kbyte data buffer (16,384 Kbytes on FCV drives). See Section 4.5. Embedded servo design Reallocation of defects on command (Post Format) Fibre Channel interface transports SCSI protocol

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Specifications:

UNFORMATTED CAPACITY (GB) 21.85 FORMATTED CAPACITY (GB) 18.37 AVERAGE SECTORS PER TRACK 424 rounded down ACTUATOR TYPE ROTARY VOICE COIL TRACKS 169,200 CYLINDERS 84,600 user HEADS (PHYSICAL) 6 DISCS (3.3 in) 3 MEDIA TYPE THIN FILM/GMR RECORDING METHOD PRML 16/17 EPR4 INTERNAL TRANSFER RATE (mbits/sec) 280 to 427 INTERNAL FORMATTED TRANSFER RATE (MB/sec) 26.7 to 40.2 EXTERNAL TRANSFER RATE (mbyte/sec/port) 106 Sync SPINDLE SPEED (RPM) 10,025 AVERAGE LATENCY (mSEC) 2.99 BUFFER (/optional FCV) Read Look-Ahead, Adaptive, Multi-Segmented Cache 4MB/16MB INTERFACE Fibre Channel - Arbitrated Loop, ASA II FC-AL BYTES PER TRACK 215,248 SECTORS PER DRIVE 35,885,167 TPI (TRACKS PER INCH) 18,145 BPI (PEAK KBITS PER INCH) 334 AVERAGE ACCESS (ms read/write) Drive level without controller overhead 5.2/6.0 SINGLE TRACK SEEK (ms read/write) 0.6/0.9 MAX FULL SEEK (ms read/write) 11.0/11.7 MTBF (power-on hours) 1,200,000 POWER REQUIREMENTS: +12V START-UP (amps) - 1.51 +12V TYPICAL (amps) - 0.42 idle +5V START-UP (amps) - 0.96 +5V TYPICAL (amps) - 0.91 idle Physical: Height (inches/mm): 1.0/25.4 Width (inches/mm): 4.00/101.6 Depth (inches/mm): 5.75/146 Weight (lbs/kg): 1.3/0.589