Specifications for the WD Caviar® WD400BB
Model: WD400BB-75CLB0
| Recommended Setup Parameters | |
| Cylinders 1 | 16383 |
| Heads | 16 |
| Sectors/Track | 63 |
| Landing Zone | 16383 |
| WPC | 16383 |
| Jumper Setting Information | Ten Pin Drive |
 |
|
1 All EIDE drives 8.4 GB and larger use 16383 cylinders, 16 heads and 63 SPT due to interface restrictions.
| Physical Specifications | |
| Formatted Capacity 1 | 40,021 MB |
| Interface | 40-pin EIDE (Fast ATA-2?? EIDE is a Western Digitial proprietary specification.) |
| Actuator Type | Rotary Voice Coil |
| Number of Disks | 2 |
| Data Surfaces | 4 |
| Number of Heads | 4 |
| Bytes Per Sector | 512 |
| User Sectors Per Drive | 78,165,360 |
| Servo Type | Embedded |
| Recording Method EPR4 | Rate 16/17 PRML |
| ECC | Reed Solomon |
| Head Park 2 | Automatic |
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 (typical) 18 ms (maximum) 10.9 ms (typical) 20 ms (maximum) |
| Track-to-Track Seek | 2.0 ms (typical) 5 ms (maximum) |
| Full Stroke Seek | 21 ms (typical) 28 ms (maximum) |
| 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) [ATA/ATAPI-6] 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) 244 Mbits/s minimum 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 |
5.5 s average, 9s maximum 4.5 s average, 7s maximum |
| 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 | 1.8 A | 560 mA | 18.4 W |
| Read/Write/Idle | 350 mA | 630 mA | 7.5 W |
| Seek | 870 mA | 660 mA | 13.7 W |
| Power Management Commands | |||
| Operating Mode | RMS Current 1 | Power, Typical 1 | |
| 12 VDC | 5 VDC | ||
| Idle (E1H) | 340 mA | 610 mA | 7.1 W |
| Standby (E0H) | 25 mA | 190 mA | 1.3 W |
| Sleep (E6H) | 25 mA | 80 mA | 0.7 W |
| Input Voltage Requirements |
| +5.0V (±5%) and 12.0V (±10%) |
| Ripple | ||
| +12 VDC | +5 VDC | |
| Maximum Frequency |
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 Guage | 18 AWG (or heavier) |
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 | 37 dBA average | |
| Seek Mode 3 3 | 34 dBA average | |
| Reliability Specifications | ||
| AFR | <0.8% | |
| MTBF | 500,000 Power On Hours | |
| Component Design Life | 5 years | |
| Warranty Period | Warranty Length | |
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.