Specifications for the WD Caviar^® WD200BB

Physical Specifications
Formatted Capacity 1	20,020 MB
Interface	40-pin EIDE
Actuator Type	Rotary Voice Coil
Number of Disks	1
Data Surfaces	2
Number of Heads	2
Bytes Per Sector	512
User Sectors Per Drive	39,102,336
Servo Type	Embedded
Recording Method EPR4	Rate 16/17 PRML
ECC	Reed Solomon
Head Park 2	Automatic
Jumper Setting Information	Ten Pin Drive

PRML - Partial Response Maximum Likelihood
EIDE - Enhanced Integrated Drive Electronics

¹ Western Digital defines a megabyte (MB) as 1,000,000 bytes and a gigabyte (GB) as 1,000,000,000 bytes
² Turning the system power off causes the WD Caviar® to perform an automatic head park operation.

Performance Specifications
Average Seek - Read - Write	8.9 ms (average) 10.9 ms (average)
Track-to-Track Seek	2.0 ms (average)
Full Stroke Seek	21 ms (average)
Index Pulse Period	8.3 ms (nominal)
Average Latency	4.2 ms (nominal)
Rotational Speed	7200 RPM (nominal)
Controller Overhead	0.3 ms average
Data Transfer Rate (maximum) - Buffer to Host - Buffer to Disk	100 MB/s (Mode 5 Ultra ATA) 66.6 MB/s (Mode 4 Ultra ATA) 33.3 MB/s (Mode 2 Ultra ATA) 16.6 MB/s (Mode 4 PIO) 16.6 MB/s (Mode 2 multi-word DMA) 400 Mbits/s maximum
Interleave	1:1
Buffer Size	2 MB
Error Rate - Unrecoverable	<1 in 1014 bits read
Spindle Start Time - From Power-on to Drive Ready 1 - From Power-on to Rotational Speed 2	6.0 s average  4.5 s average
Contact Start/Stop Cycles (CSS)	50,000 minimum

¹ Defined as the time from power-on to the setting of the Drive Ready and Seek Complete including calibration.
² Defined as the time from power-on to when the full spindle rotational speed is reached.

Physical Dimensions
Height	English:	1.028 inches max
	Metric:	26.1 mm max
Length	English:	5.787 inches max
	Metric:	147.0 mm max
Width	English:	4.00 inches ±0.010 inch
	Metric:	101.6 mm ±0.25 mm
Weight	English:	1.4 pounds ±0.14 pounds
	Metric:	0.62 kg ±0.062 kg

Electrical Specifications
Current Requirements and Power Dissipation
Operating Mode	RMS Current		Power, Typical 1
	12 VDC	5 VDC
Spinup	2.2 A	525 mA	17.0 W
Read/Write/Idle	350 mA	800 mA	8.0 W
Seek	900 mA	675 mA	14.0 W

¹ All values are typical (25°C, 5.0V, and 12V input) except where specified as maximum.

Note: Current measurements cut off frequency at 1 kHz.

Environmental Specifications
Shock 1
Operating	65 G, 2 ms (read); 20 G, 2 ms (write)
Non-operating	250 G, 2 ms
Vibration
Operating	Linear: 5-500 Hz, 0.25 G (0 to peak) Random: 10-300 Hz, 0.004 g2/Hz
Non-operating	5-20 Hz, 0.195 inches (double amplitude) 20-500 Hz, 4.0 G (0 to peak)
Sweep Rate	0.5 octave/minute minimum
Drive Generated Vibration
Operating	0.4 gm-mm typical with the drive in an unconstrained condition
Rotational Shock Non-Operating
Amplitude	20 K rad/sec2
Duration	2 ms
Operating Temperature and Humidity
Temperature	5°C to 55°C (41°F to 131°F) 5°C to 65°C (case temp)
Humidity	5-85% RH non-condensing 33°C (maximum wet bulb)
Thermal Gradient	20°C/hour (maximum)
Humidity Gradient	20%/hour (maximum)
Non-Operating Temperature and Humidity
Temperature	-40°C to 60°C (-40°F to 140°F)
Humidity	5-95% RH non-condensing 33°C (maximum wet bulb)
Thermal Gradient	30°C/hour (maximum)
Humidity Gradient	20%/hour (maximum)
Altitude
Operating	-1000 feet to 10,000 feet (-305M to 3,050M)
Non-Operating	-1000 feet to 40,000 feet (-305M to 12,200M)
Acoustics
Idle Mode 2	35 dBA average
Seek Mode 0 3	38 dBA average
Seek Mode 3 3	35 dBA average
Reliability Specifications
AFR	<0.8%
MTBF	500,000 Power On Hours
Component Design Life	5 years

¹ Half sine wave, measured without shock isolation and without non-recoverable errors.
² No audible pure tones.
³ Random seek at a rate of 26 seeks per second.