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Specifications for the WD Caviar®
WD172AA
| 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 |
17,247 MB |
| Interface |
40-pin EIDE |
| Actuator Type |
Rotary Voice Coil |
| Number of Disks |
3 |
| Data Surfaces |
5 |
| Number of Heads |
5 |
| Bytes Per Sector |
512 |
| User Sectors Per Drive |
33,687,360 |
| 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 |
9.5 ms typical, 15 ms maximum
11.5 ms typical, 17 ms maximum |
| Track-to-Track Seek |
2.0 ms typical, 5 ms maximum |
| Full Stroke Seek |
19 ms typical, 23 ms maximum |
| Index Pulse Period |
11.11 ms (nominal) |
| Average Latency |
5.5 ms (nominal) |
| Rotational Speed |
5400 RPM (nominal) |
| Controller Overhead |
0.3 ms average |
Data Transfer Rate (maximum)
- Buffer to Host
- Buffer to Disk |
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)
133.33 Mbits/s minimum
233.57 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 s typical, 16 s maximum
4.5 s typical, 12 s maximum |
| Spindle Stop Time |
4 s typical |
| Contact Start/Stop Cycles (CSS) |
40,000 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: |
1.00 inch ±0.02 inch |
| |
Metric: |
25.4 mm ±0.51 mm |
| Length |
English: |
5.75 inches ±0.02 inch |
| |
Metric: |
146.05 mm ±0.51 mm |
| Width |
English: |
4.00 inches ±0.02 inch |
| |
Metric: |
101.6 mm ±0.51 mm |
| Weight |
English: |
1.1 pounds ±0.11 pounds |
| |
Metric: |
0.500 kg ±0.050 kg |
| Electrical
Specifications |
| Current Requirements
and Power Dissipation |
| Operating Mode |
RMS Current |
Power, Typical 1 |
| |
12 VDC |
5 VDC |
|
| Spinup |
1.8 A max |
530 mA |
24.3 W |
| Read/Write/Idle |
240 mA |
660 mA |
6.18 W |
| Seek |
580 mA |
600 mA |
9.96 W |
| Power Management
Commands |
| Operating Mode |
RMS Current 1 |
Power, Typical 1 |
| |
12 VDC |
5 VDC |
|
| Idle (E1H) |
240 mA |
660 mA |
6.18 W |
| Standby (E0H) |
30 mA |
192 mA |
1.32 W |
| Sleep (E6H) |
30 mA |
96 mA |
0.84 W |
| Input Voltage Requirements |
| +5.0V (±5%) and 12.0V (±10%) |
| Ripple |
| |
+12 VDC |
+5 VDC |
Maximum
Frequency |
200 mV (double amplitude)
0-20 MHz |
100 mV (double amplitude)
0-20 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 |
20 G, 2 ms |
|
| Non-operating |
200 G, 2 ms |
| Vibration |
| Operating |
5-20 Hz, 0.037 inches (double amplitude)
20-300 Hz, 0.75 G (0 to peak) |
| Non-operating |
5-20 Hz, 0.195 inches (double amplitude)
20-500 Hz, 4.0 G (0 to peak) |
| Sweep Rate |
One-octave/minute minimum |
| Drive Generated Vibration |
| Operating |
0.10 G maximum with the drive in an unconstrained
condition. |
| Rotational Shock Non-Operating |
| Amplitude |
15K rad/sec2 |
| Duration |
2 ms |
| Operating Temperature and Humidity |
| Temperature 2 |
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 3 |
-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 4 |
33 dBA average, 37 dBA maximum |
| Seek Mode 5 |
39 dBA average, 43 dBA maximum |
| Reliability Specifications |
| AFR |
<0.8% |
| MTBF |
500,000 Power On Hours |
| MTTR |
10 minutes (typical) |
| Component Design Life |
5 years |
| Warranty Period |
Warranty Length |
1 Half sine wave, measured without shock
isolation and without non-recoverable errors.
2 The system environment must allow sufficient air flow.
3 To ensure test is non-condensing, set chamber RH to 85%
maximum. To maintain 85% max, set dry bulb to 35.5ºC which maintains 33ºC
wet bulb.
4 No audible pure tones.
5 Random seek at a rate of 26 seeks per second.
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