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Specifications for the WD Caviar AC2850
| Recommended Setup Parameters |
| Cylinders |
1654 |
| Heads |
16 |
| Sectors/Track |
63 |
| Landing Zone |
1654 |
| WPC |
1654 |
| Jumper Setting Information |
Six Pin Drive |
 |
| Physical Specifications |
| Formatted Capacity |
853 MB |
| Interface |
40-pin EIDE |
| Actuator Type |
Rotary Voice Coil |
| Number of Platters |
2 |
| Data Surfaces |
4 |
| Number of Heads |
4 |
| Bytes Per Sector |
512 |
| User Sectors Per Drive |
1,667,232 |
| Servo Type |
Embedded |
| Recording Method |
1,7 RLL |
| ECC |
Reed Solomon |
| Head Park** |
Automatic |
** 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*
- From Power-on to Rotational Speed |
10s typical
5s 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:
1.21 pounds
Metric:
.549
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 |
1.5 W |
| Sleep |
1.5 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)
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| 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)
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| Acoustics |
Idle Mode**
37 dBA (typical)
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| Reliability |
MTBF
300,000 Hours
Warranty Period
Warranty Status
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* Half sine wave, measured without shock isolation and without non-recoverable errors.
** No audible pure tones.
1As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment.
2As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s)= one billion bits per second.
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