Physical Specifications
Formatted Capacity 1	40,020 MB
Interface	40-pin EIDE
Actuator Type	Rotary Voice Coil
Bytes Per Sector	512
User Sectors Per Drive	78,165,360
Servo Type	Embedded
ECC	Reed Solomon
Head Park 2	Automatic
Jumper Setting Information	Ten Pin Drive

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

Performance Specifications
Average Seek - Read - Write	12.8 ms typical 13.8 ms typical
Track-to-Track Seek	2.0 ms average
Full Stroke Seek	28.5 ms average
Index Pulse Period	8.3 ms (nominal)
Average Latency	4.2 ms (nominal)
Rotational Speed	5400 RPM (nominal)
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) 695 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
Spindle Stop Time	5.1 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:	0.95 pounds (average) �0.13 pounds
	Metric:	0.43 kg (average) �0.06 kg

Electrical Specifications
Current Requirements and Power Dissipation
Operating Mode	RMS Current		Power, Typical 1
	12 VDC	5 VDC
Spinup	1.425 A max	350 mA	12.5 W
Read/Write	320 mA	360 mA	5.75 W
Seek	525 mA	340 mA	8 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	20 G, 2 ms (write) 65 G, 2 ms (read)
Non-operating	350 G, 2 ms
Vibration
Operating	Linear: 20-300 Hz, 0.75 G (0 to peak) Random: 10-300 Hz, 0.008 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	0.2 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)
Humidity	5-95% 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 65°C (-40°F to 149°F)
Humidity	5-95% RH non-condensing 35°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	30 dBA average
Seek Mode 0 3	32 dBA average
Seek Mode 3 3	31 dBA average
Reliability Specifications
AFR	<0.8%
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.