Western Digital AC418000 HARD DISK DRIVE REPAIR, Western Digital AC418000 HARD DISK DRIVE SPECIFICATIONS,
Western Digital AC418000 hard disk drive sales, Western Digital AC418000 hard disk drive repair, Western Digital AC418000 hard disk drive specifications, 
Western Digital AC418000 Hard Disk Drive Repair, Western Digital AC418000 Hard Disk Drive Specifications, Western Digital AC418000 Western Digital AC418000
Specifications



western digital ac418000 picture.
western digital ac418000 picture.
western digital ac418000 picture.

Western Digital AC418000 Specifications
Model Capacity Size Height Bus Type Int.Type
AC418000 18.0GB 3.5" SL ATA4 Ultra

Specifications for the WD Caviar AC418000

Recommended Setup Parameters
Cylinders* 16383
Heads 16
Sectors/Track 63
Landing Zone 16383
WPC 16383
Jumper Setting Information Nine Pin Drive
9 pin Jumper Settings

* All EIDE drives 8.4 GB and larger use 16383 cylinders, 16 heads and 63 SPT due to interface restrictions.

Physical Specifications
Formatted Capacity* 18,042 MB
Interface 40-pin EIDE
Actuator Type Rotary Voice Coil
Number of Platters 4
Data Surfaces 8
Number of Heads 8
Bytes Per Sector 512
User Sectors Per Drive 35,239,680
Servo Type Embedded
Recording Method Rate 16/17 PRML
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) 9 ms (typical) 9.5 ms (maximum)
Average Seek (Write) 9.5 ms (typical) 10.5 ms (maximum)
Track to Track Seek 2.2 ms (typical)2.9 ms (maximum)
Full Stroke Seek (Read) 15.5 ms (typical) 18 ms (maximum)
Full Stroke Seek (Write) 16 ms (typical) 19 ms (maximum)
Index Pulse Period 8.33 (nominal)
Average Latency 4.17 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Controller Overhead 0.3 ms average
Transfer Rate (Buffer to Host) 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)
Transfer Rate (Buffer to Disk) 139.61 Mbits/s minimum
224.31 Mbits/s maximum
Interleave 1:1
Buffer Size 2 MB
Error Rate (Non-Recoverable) <1 in 1013 bits read
Spindle Start Time
- From Power-on to Drive Ready*
 
18s typical, 31s maximum
Spindle Stop Time 4s typical
Contact Start/Stop Cycles (CSS) 40,000 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 (±0.40 mm)

Length English:
5.75 inches (±0.02 inch)

Metric:
146.05 mm (±0.60 mm)
Width English:
4.00 inches (±0.02 inch)

Metric:
101.6 mm (±0.40 mm)
Weight (min) English:
1.23 pounds

Metric:
.56 kg
Weight (max) English:
1.38 pounds

Metric:
.63 kg

Electrical Specifications
Current Requirements and Power Dissipation
Operating Mode RMS Current* Power, Typical*
  12 VDC 5 VDC  
Spinup 2.04 A max 720 mA 28.1 W max
Read/Write/Idle 580 mA 350 mA 7.3 W
Seek 620 mA 290 mA 10.1 W
Power Management Commands
Operating Mode RMS Current* Power, Typical*
  12 VDC 5 VDC  
Idle (E1H) 420 mA 250 mA 6.9 W
Standby (E0H) 9 mA 130 mA 0.76 W
Sleep (E6H) 7 mA 52 mA 0.35 W
Input Voltage Requirements
+5.0V (±5%) and 12.0V (±8%)
Ripple
    +12 VDC +5 VDC
Maximum
Frequency
150 mV (double amplitude)
0-10 MHz
100 mV (double amplitude)
0-10 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)

* 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:*

Operating
10 G  (2 per minute maximum, half sine wave 11 ms)
65 G  (2 per minute maximum, half sine wave 2 ms)

Non-operating
75 G (3 drops per axis maximum, half sine wave 11 ms)
175 G (3 drops per axis maximum, half sine wave 2 ms)

Vibration

Operating
5-300 Hz, 0.5 G (0 to peak)

Non-operating
5-500 Hz, 2.0 G (0 to peak)

Sweep Rate
One-half octave/minute

Rotational Shock

Amplitude
18K rad/sec2

Duration
2 ms

Operating Temperature and Humidity

Temperature
5º C to 55º C (41ºF to 131ºF)

Humidity
8-90% RH non-condensing
29.4º C (maximum wet bulb)

Thermal Gradient
15°C/hour (maximum)

Non-Operating Temperature and Humidity

Temperature
-40º C to 65º C (-40ºF to 149ºF)

Humidity
5-95% RH non-condensing
35º C (maximum wet bulb)

Thermal Gradient
15°C/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**
38 dBA (average)  
42 dBA (maximum)

Seek Mode***
45 dBA (average)
48 dBA (maximum)

Reliability AFR
<1%

MTBF
750,000 Power On Hours

Component Design Life
5 years

Warranty Period
Warranty Status

* Half sine wave, measured without shock isolation and without non-recoverable errors.

** No audible pure tones.

*** Random seek at a rate of 26 seeks per second.


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