Western Digital AC2635 HARD DISK DRIVE REPAIR, Western Digital AC2635 HARD DISK DRIVE SPECIFICATIONS,
Western Digital AC2635 hard disk drive sales, Western Digital AC2635 hard disk drive repair, Western Digital AC2635 hard disk drive specifications, 
Western Digital AC2635 Hard Disk Drive Repair, Western Digital AC2635 Hard Disk Drive Specifications, Western Digital AC2635 Western Digital AC2635
Specifications



western digital ac2635 picture.
western digital ac2635 picture.
western digital ac2635 picture.

Western Digital AC2635 Specifications
Model Capacity Size Height Bus Type Int.Type
AC2635 Caviar 639MB 3.5" SL ATA2 Fast

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
10 and 6 Pin Jumper Settings

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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