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| Western Digital 40GB 7200rpm hard drives
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 the 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.
To protect your data, WD developed Data LifeguardTM, WD's exclusive combination of hardware features and software utilities. Data Lifeguard includes embedded features that guard your data and software tools that make installation, configuration and diagnostics simple and worry-free.
Speed, performance and reliability are the key features of the WD Caviar 7200 RPM series.
Feature and Benefits
• Bulk (Software portion of Data LifeGuard is not included; however you may download it for free at Western Digital's website. Please click here.)
• 40GB Capacity.
• Data Lifeguard Features
o Embedded error detection and repair features that automatically detect, isolate and repair problem areas that may develop over the extended use of the drive.
o S.M.A.R.T. monitors hard drive operation to predict errors before data loss occurs.
o Protective head parking is an exclusive new feature that adds another layer of protection to Auto Park by safely parking the heads even if other system components lose functionality.
o Environmental protection filters offer added protection to the inside of the drive from humidity, temperature and contamination.
Specifications
Recommended Setup Parameters
Cylinders 16383
Heads 16
Sectors/Track 63
Landing Zone 16383
WPC 16383
Physical Specifications
Formatted Capacity 40,020 MB
Interface 40-pin EIDE
Actuator Type Rotary Voice Coil
Number of Platters 1
Data Surfaces 2
Number of Heads 2
Bytes Per Sector 512
User Sectors Per Drive 39,102,336
Servo Type Embedded
Recording Method Rate 16/17 PRML
ECC Reed Solomon
Head Park Automatic
Performance Specifications
Average Seek (Read) 8.9 ms typical
Average Seek (Write) 10.9 ms typical
Track to Track Seek 2.0 ms typical
Full Stroke Seek (Read) 21 ms typical
Index Pulse Period 8.3 ms (nominal)
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM(nominal)
Transfer Rate (Buffer to Host) 100 MB/s (Mode 5 Ultra ATA)
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)
244 Mbits/s minimum
400 Mbits/s maximum
Interleave 1:1
Buffer Size 2MB
Error Rate (Non-Recoverable) <1 in 1014 bits read
Spindle Start Time - From Power-on to Drive Ready 5.5 s typical, 9s maximum
Spindle Start Time - From Power-on to Rotational Speed 4.5 s average
Contact Start/Stop Cycles (CSS) 40,000 minimum
Electrical Specifications
Current Requirments and Power Dissipation
Spinup: 18.4 W
Read/Write/Idle: 7.5 W
Seek: 13.7 W
Power Management Commands Idle (E1H): 7.1 W Standby (E0H): 1.3 W Sleep (E6H): 0.7 W
Environmental Specifications
Shock* Operating: 65G, 2 ms (read); 20G, 2 ms (write)
Non-Operating: 250G, 2 ms
Operating Temperature 5?C to 55?C (41?F to 131?F)
Acoustics Idle Mode (average dBA)** 34
Seek Mode 0 (average dBA)*** 36
Seek Mode 3 (average dBA)*** 33
Reliability Specifications AFR <0.8%
Component Design Life 5 years
Specifications subject to change without notice.
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