Western Digital WD400BD 40 GB, 7200 RPM, 2 MB Cache Hard Drive | WD400BD | 30 GB to 49 GB

Description

Features

Specifications

WD Caviar SATA hard drives are designed for mainstream desktop personal computers. They feature a fast 7200 RPM spindle speed, a 2 MB cache buffer, and up to 250 GB of storage. WD Caviar drives are built to the highest standards of quality and reliability by people who understand the importance of your data. Data Lifeguard is an exclusive set of data protection features: shock protection, an environmental protection system and real-time embedded error detection and repair. WD's Data Lifeguard technology automatically finds, isolates, and repairs problems that may develop from extended use of a hard drive. Data Lifeguard Tools are software utilities designed for WD hard drives. They work with embedded Data Lifeguard features to make hard drive installation, diagnostics and repair simple and worry-free. ShockGuard instantly protects the hard drive against damage from bumps and vibrations while it's running. It gives WD Caviar drives industry-leading shock protection.

Performance Specifications
Rotational Speed	7,200 RPM (nominal)
Buffer Size	2 MB
Average Latency	4.20 ms (nominal)
Contact Start/Stop Cycles	50,000 minimum
Seek Times
Read Seek Time	8.9 ms
Write Seek Time	10.9 ms (average)
Track-To-Track Seek Time	2.0 ms (average)
Full Stroke Seek	21.0 ms (average)
Transfer Rates
Buffer To Host (Serial ATA)	300 MB/s (Max)
Buffer To Disk	748 Mbits/s (Max)
Physical Specifications
Formatted Capacity	40,020 MB
Capacity	40 GB
Interface	SATA 300 MB/s
Number of Platters	1
User Sectors Per Drive	78,165,360
Physical Dimensions
Height (English)	1.028 Inches (Max)
Length (English)	5.787 Inches (Max)
Width (English)	4.00 Inches (+/- 0.010 inch)
Weight (English)	1.60 Pounds (+/- .10 lb)
Height (Metric)	26.1 mm (Max)
Length (Metric)	147 mm (Max)
Width (Metric)	101.6 mm
Weight (Metric)	0.73 kg (+/- .082 kg)
Shock
Operating Shock (Read)	65G, 2 ms
Non-operating Shock	350G, 2 ms
Acoustics
Idle Mode	30 dBA (average)
Seek Mode 0	32 dBA (average)
Seek Mode 3	31 dBA (average)
Temperature (English)
Operating	41° F to 131° F
Non-operating	-40° F to 149° F
Temperature (Metric)
Operating	5° C to 55° C
Non-operating	-40° C to 65° C
Humidity
Operating	5-95% RH non-condensing
Non-operating	5-95% RH non-condensing
Altitude (English)
Operating	-1,000 feet to 10,000 feet
Non-operating	-1,000 feet to 40,000 feet
Altitude (Metric)
Operating	-305M to 3,050M
Non-operating	-305M to 12,200M
Operating
Linear	10-300 Hz, 3.0G (0 to peak)
Random	10-300 Hz, 0.008 g² / Hz
Non-operating
Low Frequency	5-20 Hz, 0.195 inches (double amplitude)
High Frequency	20-300 Hz, 4.0G (0 to peak)
Current Requirements
12 VDC	Read/Write: 450 mA Idle 470 mA Standby: 23 mA Sleep: 23 mA
5 VDC	Read/Write: 800 mA Idle: 750 mA Standby: 330 mA Sleep: 200 mA
Power Dissipation

Western Digital WD400BD 40 GB, 7200 RPM, 2 MB Cache Hard Drive | WD400BD

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