Seagate ST318404LW SCSI Hard Drives

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

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)

• 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