Specifications
Part number 5503056

The following table provides specifications for the Western Digital 120-GB 7200-RPM SATA hard drive.

Physical
Western Digital Model Number WD1200JD
Formatted Capacity
(Where a megabyte (MB) is defined as 1,000,000 bytes and a gigabyte (GB) as 1,000,000,000 bytes)		 120,034 MB
Used Sectors Per Drive 234,441,648
Interface 1.5 Gb/s Serial ATA 1.0
Bytes Per Sector 512
Dedicated Landing Zone Yes
Actuator Latch/Auto Park Yes
Dimensions (H × L × W) 1.028 × 5.787 × 4.0 inches (25.4 × 147.0 × 101.6 mm) ± .01 in.
Weight 1.32 lb. (0.60 kg) ± 10%
Performance
Data Transfer Rate (maximum)
  • Buffer to Host: 150 MB/s max. (Maximum burst rate running the specified PIO, DMA, Ultra ATA, or Serial ATA transfer mode.)
  • Buffer to Disk: 748 Mbits/s max.
Average Read Seek 8.9 ms (average)
Track-to-track Seek
(On reads and writes)		 2.0 ms (average)
Full Stroke Read Seek
(On reads and writes)		 21 ms (average)
Average Latency 4.2 ms
Rotational Speed 7200 RPM
Read Cache Adaptive
Write Cache Yes
Buffer 8 MB
Drive Ready Time 9.0 sec (average)
Start/Stop Cycles 50,000 min.
Error Rate
(Non-recoverable)		 <1 in 1014 bits read
LBA Support Yes
Power Requirements per Mode
Read/Write (Based on 20% duty cycle)
  • 12 V (± 10%): 530 mA
  • 5 V (±5%): 850 mA
  • Power: 16.6 W
Idle
  • 12 V (± 10%): 510 mA
  • 5 V (±5%): 780 mA
  • Power: 10.0 W
Standby
  • 12 V (± 10%): 30 mA
  • 5 V (±5%): 300 mA
  • Power: 1.8 W
Sleep
  • 12 V (± 10%): 30 mA
  • 5 V (±5%): 190 mA
  • Power: 1.3 W
Environmental
Shock Operating (2ms): 30 G (write), 65 G (read)
Non-operating (2ms): 250 G
Half sine wave measured in 2 ms duration, measured without isolation.
Vibration Operating:
  • Random 0.004 g2/Hz (10 to 300 Hz)
  • Linear 20-300 Hz, 0.75G (0 to peak)

Non-operating:

  • Linear 5-20 Hz, 0.195 inches (dbl amp)
  • 20-500 Hz, 4G (0 to peak)
Temperature Operating: 5° C to 55 ° C
Non-Operating: -40° C to 65° C
Humidity Operating: 5-95% RH non-condensing
Non-Operating: 5-95% RH non-condensing
Thermal Gradient Operating: 20 ° C/hour (maximum)
Non-Operating: 30 ° C/hour (maximum)
Acoustics Mode (average)
  • Idle: 34 dBA
  • Seek Mode 0: 36 dBA
  • Seek Mode 3: 35 dBA