WD Specifications
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Feature Description
Manufacturer Western Digital
Model WD1200BEVS-22UST0
Size 120 GB
Interface SATA 1.5 Gb/s
Actuator type Rotary voice coil
Number of disks 1
Data surfaces 2
Number of heads 2
Bytes per sector 512
User sectors per drive 234,441,648
Servo type Embedded
Recording method Partial DC Target
ECC Reed-Solomon
Average seek Read 12 ms (average)
Average seek Write 13 ms (average)
Track-to-track seek 2.0 ms (average)
Full stroke seek 21 ms (average)
Index pulse period 11.1 ms (nominal)
Average latency (msec) 5.5
Rotational speed 5,400 RPM
Data transfer rate
  • Buffer to host: 1.5 Gb/s maximum
  • Buffer to disk: 850 Mbits/s maximum
Interleave 1:1
Buffer size 8 MB
Error rate (non-recoverable) <1 in 1014 bits read
Spindle start time Power-on to drive ready: 4.0s average
Power-on to rotational speed: 2.0s average
Spindle stop time 5.1s average
Load/Unload cycle 600,000
Power requirement 5 V
Temperature Operating: 0 to 60° C (32 to 140° F)
Non-operating: -40 to 65° C (-40 to 149° F)
Humidity Operating: 8 to 90° RH non-condensing
Non-operating: 5 to 95° RH non-condensing
Shock Operating: 2 msec (Gs): 300G
Non-operating: 1 msec (Gs): 900G
Height 9.5 millimeters ( .374-inches)
Width 69.85 mm (2.75-inches)
Depth 100 mm (3.945-inches)
Weight 99 grams (0.22 pounds)