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Western Digital

40GB Caviar® Hard Disk Drive

3.5-Inch | EIDE 100MB/s | 7200RPM | 2MB Cache
Fast - Cool - Quiet
Western Digital's WD Caviar 7200 RPM EIDE hard drives are the performance champions for advanced desktop personal computers. The latest drives achieve world-class areal densities and a wide range of drive capacities ideal for storing Internet downloads, music and video files. WD Caviar 7200 RPM drives offer an Ultra ATA/100 interface, low seek times and up to 100 MB/s data transfer rates, all of which add up to a fast data delivery system. Speed, performance and reliability are the key features of the WD Caviar 7200 RPM series.

40GB Western Digital Caviar SE Specifications:

Specifications

Form Factor
3.5″ HDD
Interface
EIDE 100 MB/s
Capacity1
40GB
Formatted Capacity2
37GiB
Rotational Speed
7200 RPM
Cache / Data Buffer
2MB
Manufacturer Model Number
WD400BB
Format

Physical

Height (max)
25.4mm (1.028″)
Width (max)
101.6mm (4.00″)
Length (max)
147mm (5.787″)
Weight (typical)
0.63kg (1.39 lbs.)
Guaranteed Sectors
78,165,360

Reliability3

Contact Start-Stops
40,000 minimum
Warranty
1 Year OWC Fulfilled Limited Warranty

Performance

Transfer Rate (Max)
100 MB/s
Track-to-track Seek
2.0ms
Average Latency
4.20ms

Power

Read Power
7.5 Watts
Write Power
7.5 Watts
Idle Mode
7.5 Watts
Standby Mode
0.7 Watts
Sleep Mode
0.7 Watts

Environmental (Operating)

Shock
65 G max at 2ms
Ambient Temperature (°F)
32°F to 140°F
Ambient Temperature (°C)
0°C to 60°C
Vibration
20-300 Hz, 0.75 G (0 to peak)
Relative Humidity (non-condensing)
5% to 95%
Altitude
-1,000 feet to 10,000 feet

Environmental (Non-Operating)

Shock
350 G max at 2ms
Ambient Temperature (°F)
-40°F to 149°F
Ambient Temperature (°C)
-40°C to 65°C
Vibration
300-500 Hz, 5.0G (0 to peak)
Relative Humidity (non-condensing)
5% to 95%
Altitude
-1,000 feet to 40,000 feet

Acoustics

Idle (Typical)
3.4 bels
Seek (Typical)
3.6 bels
  1. 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences.
  2. In terms of standard gigabytes, 1GiB ≈ 1.074GB and refers to the actual formatted capacity of shown under Mac OS 10.5 or earlier and Microsoft Windows OS.
  3. Specific application environments such as temperature and duty cycle will affect the overall reliability rates.
Manufacturer provided specifications for Western Digital p/n WD400BB UPC#: 718037103648