Legacy Products

Over 10.2 GB


Specifications for the WD Protégé® WD400EB

Physical Specifications
Performance Specifications
Physical Dimensions
Electrical Specifications
Environmental Specifications

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
10 Pin Jumper Settings

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
Power Management Commands
Operating Mode  RMS Current 1 Power, Typical 1
  12 VDC 5 VDC  
Idle (E1H) 310 mA 330 mA 5.5 W
Standby (E0H) 19 mA 55 mA 0.5 W
Sleep (E6H) 19 mA 43 mA 0.45 W
Input Voltage Requirements
+5.0V (5%) and 12.0V (10%)
  +12 VDC +5 VDC
200 mV (double amplitude)
0-30 MHz
100 mV (double amplitude)
0-30 MHz
Power Connectors and Cables
Power Connector 4-pin AMP (P/N 84069-1 or equivalent)
Mating Connector Body (AMP 1-480424-0 or equivalent)
Pins (AMP 60619-4 or equivalent)
Power Cable Wire gauge 18 AWG (or heavier)

1  All values are typical (25C, 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
  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)
  Operating -1000 feet to 10,000 feet (-305M to 3,050M)
  Non-Operating -1000 feet to 40,000 feet (-305M to 12,200M)
  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.

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