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Seagate Cheetah 18XL 18GB 10K U160 68pin SCSI Hard Drive ST318404LW

Categories SCSI Hard Drives 68-Pin
Brand Name: ST318404LW
Model Number: ST318404LW
Products Status: Stock
Application: Server
Type: Internal
Style: HDD
Size: 3.5
Interface Type: SCSI
Speed: 10000rpm
Cache: 4MB
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    Seagate Cheetah 18XL 18GB 10K U160 68pin SCSI Hard Drive ST318404LW

    Drive Summary

    Capacity: 18GB
    Spindle Speed: 10,000RPM
    Interface Type: SCSI 68pin / HD68 Female
    Disk Size: 3.5"x1.0" (LFF Hard Drive)
    Sustained Throughput (MBps): 52 to 68
    Average Seek Time (read/write ms): 5.2 / 6.2
    Electrical Interface Speed: SCSI LVD U160 - 160MBps 16-bit
    On-Board Cache: 4MB

    Detailed Description

    Standard features

    The Cheetah 18XL family has the following standard features:

    • Integrated Ultra160 SCSI controller
    • Multimode SCSI drivers and receivers—single-ended (SE) and low voltage differential (LVD)
    • 16 bit I/O data bus
    • Asynchronous and synchronous data transfer protocol
    • Firmware downloadable via SCSI interface
    • Selectable even byte sector sizes from 512 to 4,096 bytes/sector
    • Programmable sector reallocation scheme
    • Flawed sector reallocation at format time
    • Programmable auto write and read reallocation
    • Reallocation of defects on command (post format)
    • Enhanced ECC maximum burst correction length of 240 bits with a guaranteed burst correction length of 233 bits.
    • Sealed head and disc assembly
    • No preventative maintenance or adjustment required
    • Dedicated head landing zone
    • Embedded servo design
    • Self diagnostics performed when power is applied to the drive
    • 1:1 Interleave
    • Zoned bit recording (ZBR)
    • Vertical, horizontal, or top down mounting
    • Dynamic spindle brake
    • 4,096 kbyte data buffer
    • Hot plug compatibility (Section 9.6.4.2 lists proper host connector needed) for “LC” model drives
    • Drive Self Test (DST)


    Compatibility

    Specifications
    ST-318404LW               UNFORMATTED CAPACITY (GB)
    ________________         FORMATTED CAPACITY (GB)
    __________________18.351         AVERAGE SECTORS PER TRACK
    ________________415 rounded down         ACTUATOR TYPE
    ____________________________ROTARY VOICE COIL         TRACKS
    ___________________________________86,304         CYLINDERS
    ________________________________14,384 user         HEADS
    ______PHYSICAL______________________6         DISCS (3.5 in)
    ___________________________3         MEDIA TYPE
    _______________________________THIN FILM/GMR         RECORDING
    METHOD _________________________PRML 16/17 EPR4         INTERNAL
    TRANSFER RATE (mbits/sec)________285 to 424         INTERNAL
    FORMATTED TRANSFER RATE (MB/sec)_26 to 40         EXTERNAL TRANSFER
    RATE (mbyte/sec) _______40 Sync              Low Voltage
    Differential(LVD) _______80/160 Sync         SPINDLE SPEED (RPM)
    ______________________10,033         AVERAGE LATENCY (mSEC)
    ___________________2.99         BUFFER (/optional)
    _______________________4MB/16MB           Read Look-Ahead,
    Adaptive,           Multi-Segmented Cache         INTERFACE
    ________________________________Ultra SCSI Wide                Low
    Voltage Differential __________Ultra3-SCSI Wide                ASA
    II, SCAM level 2 (1 default)         BYTES PER TRACK
    __________________________203,008 avg         SECTORS PER DRIVE
    ________________________35,843,669         TPI (TRACKS PER INCH)
    ____________________18,145         BPI (PEAK KBITS PER INCH)
    ________________339         AVERAGE ACCESS (ms
    read/write)____________5.2/5.8           Drive level without
    controller overhead         SINGLE TRACK SEEK (ms read/write)
    ________0.6/0.9         MAX FULL SEEK (ms read/write)
    ____________10.0/11.0         MTBF (power-on hours)
    ____________________1,200,000         SHOCK (G's, 11/2/.5 ms):     
                operating (Read/Write) __________15                 
    abnormal ________________________15                  nonoperating
    ____________________150/250/         ACOUSTICS (Bels typical)
    ________Idle ____3.8                                           Max
    ____         POWER DISSIPATION (watts/BTUs) Active ____/           
                                Idle ______8.5/29.0         POWER
    REQUIREMENTS: +12V START-UP (amps) _1.7                            
    +12V TYPICAL (amps) __0.40 idle                             +5V
    START-UP (amps) __0.7                             +5V TYPICAL
    (amps) ___0.70 idle                             IDLE (watts)
    _________9         IBM AT DRIVE TYPE ________________________0 or
    NONE           Physical:                          Height
    (inches/mm):     1.02/26.13                          Width 
    (inches/mm):     4.01/101.98                          Depth 
    (inches/mm):     5.77/146.68                          Weight   
    (lbs/kg):      1.5/0.680                        

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