|
Specifications for the WD Caviar
AC2635
| Recommended Setup
Parameters |
| Cylinders |
1240 |
| Heads |
16 |
| Sectors/Track |
63 |
| Landing Zone |
1240 |
| WPC |
1240 |
| Jumper Setting Information |
Six Pin Drive |
 |
| Physical
Specifications |
| Formatted Capacity* |
639 MB |
| Interface |
40-pin EIDE |
| Actuator Type |
Rotary Voice Coil |
| Number of Platters |
2 |
| Data Surfaces |
3 |
| Number of Heads |
3 |
| Bytes Per Sector |
512 |
| User Sectors Per Drive |
1,249,920 |
| Servo Type |
Embedded |
| Recording Method |
1,7 RLL |
| ECC |
Reed Solomon |
| Head Park** |
Automatic |
* Western Digital defines a megabyte (MB) as 1,000,000 bytes and a
gigabyte (GB) as 1,000,000,000 bytes.
** Turning the system power off causes the WD Caviar to perform an
automatic head park operation.
| Performance
Specifications |
| Average Seek (Read) |
10 ms |
| Track to Track Seek |
4.0 ms |
| Full Stroke Seek |
23 ms
|
| Average Latency |
6.67 ms |
| Rotational Speed |
4500 RPM |
| Transfer Rate (Buffer
to Host) |
13.3 MB/s (burst DMA)
11.1 MB/s (burst PIO) |
| Interleave |
1:1 |
| Buffer Size |
64 K |
| Error Rate (Non-Recoverable) |
<1 in 1013 bits read |
Spindle Start Time
- From Power-on to Drive Ready* |
9s typical |
| Contact Start/Stop Cycles (CSS) |
50,000 minimum |
* Defined as the time from power-on to the setting of the Drive Ready and
Seek Complete including calibration.
| 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 (min) |
English:
1.1 pounds (±0.1 pound)
Metric:
.544 kg (±0.045 kg)
|
| Electrical
Specifications |
| Current Requirements and
Power Dissipation |
| Operating Mode |
Power, Typical* |
| Spinup |
12.7 W |
| Read/Write |
4.6 W |
| Power
Management Commands |
| Operating Mode |
Power, Typical* |
| Idle |
4.6 W |
| Standby |
0.5 W |
| Sleep |
0.5 W |
|
Input Voltage Requirements
|
|
+5.0V (±5%) and 12.0V (±8%)
|
* All values are typical (25°C, 5.0V, and 12V input) except where
specified as maximum.
| Environmental
Specifications |
| Shock:* |
Operating
10 G
Non-operating
150 G |
| 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)
|
| Operating Temperature and Humidity |
Temperature
5º C to 55º C (41ºF to 131ºF)
Humidity
8-80% RH non-condensing
Thermal Gradient
10°C/hour (maximum) |
| Non-Operating
Temperature and Humidity |
Temperature
-40º C to 60º C (-40ºF to 140ºF)
Humidity
5-95% RH non-condensing
Thermal Gradient
20°C/hour (maximum)
|
| Acoustics |
Idle Mode**
37 dBA (typical) |
| Reliability |
MTBF
300,000 Hours
Warranty Period
3 years
|
* Half sine wave, measured without shock isolation and without
non-recoverable errors.
** No audible pure tones.
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