IBM 19K1484 SCSI Hard Drive

Capacity: 18GB
Spindle Speed: 10,000RPM
Interface Type: SCSI 68pin / HD68 Female
Disk Size: 3.5″x1.0″ (LFF Hard Drive)
Sustained Throughput (MBps): 26 to 40
Average Seek Time (read/write ms): 5.2 / 5.8
Electrical Interface Speed: SCSI LVD U160 – 160MBps 16-bit
On-Board Cache: 4MB

Cheetah 18XL drives combine giant magnetoresistive (GMR) heads, partial response/maximum likelihood (PRML) read channel electronics, embedded servo TECHNOLOGY, and a wide Ultra160 SCSI interface to provide high performance, high capacity data storage for a variety of systems including engineering workstations, network servers, mainframes, and supercomputers.

Seagate part ST318404LW

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

Already low-level formatted at the factory with x spare SECTORS at
the end of each x cylinder region.  

ZBR = Zone Bit Recording = Variable sectors per track