Product Details Western Digital offers WD Caviar SE Serial ATA (SATA) hard drives with features and capacities that are ideal for next-generation computers and low-end enterprise storage. Users benefit from a data transfer rate performance roadmap that begins with 150 MB/s and extends to 600 MB/s, as well as improved cabling that enables greater system design flexibility. Designers of enterprise storage systems and servers are increasingly using desktop-class, large-capacity SATA hard drives because of the advantages that the SATA interface provides. WD CAVIAR SE PRODUCT BENEFITS 8 MB cache buffer – fast data transfer from a cache four times larger than the industry-standard 2 MB size. 7200 RPM – high-performance rotational speed for high-capacity hard drives. Data Lifeguard Tools™ – software utility that works in conjunction with the embedded Data Lifeguard features (including shock protection, an environmental protection system, and embedded error detection and repair features) to make hard drive management diagnostics and repair simple and worry-free. SecureConnect™ – provides a 500 percent stronger cable-to-drive connection than first-generation SATA hard drives and cables; ensures backward compatibility with legacy SATA cables and backplanes. FlexPower™ – connector technology that accepts power from both industry-standard and new SATA power supplies. Point-to-point bus configuration – utilizes the full bandwidth of each drive interface in a networked environment. Hot plug support – ability to swap out a hard drive without having to power down the system or reboot promotes system design flexibility, data availability, and serviceability. Backplane compatibility – promotes expandability and flexibility in system architecture. Longer, narrower cable – prevents incorrect mating and bent pins, providing greater reliability and reduced service calls. Physical Specifications Formatted Capacity 1 250,059 MB Interface 1.5 Gb/s Interface (Serial ATA 1.0) Bytes Per Sector (STD) 512 User Sectors Per Drive 488,397,168 Dedicated Landing Zone Yes Actuator Latch/Auto Park Yes Performance Specifications Data Transfer Rate - Buffer to Host - Buffer to Disk 150 MB/s 2 748 Mbits/s max Average Read Seek 8.9 ms (average) Track-to-Track Seek 3 2.0 ms (average) Full Stroke Read Seek 3 21 ms (average) Average Latency 4.2 ms Rotational Speed 7200 RPM Read Cache Adaptive Write Cache Yes Buffer 8 MB Drive Ready Time 9.0 sec (average) Start/Stop Cycles 50,000 minimum LBA Support Yes Error Rate (non-recoverable) <1 in 1014 bits read Physical Dimensions Height English: 1.028 inches max Metric: 25.4 mm max Length English: 5.787 inches max Metric: 147.0 mm max Width English: 4.00 inches ±0.010 inch Metric: 101.6 mm ±0.25 mm Weight English: 1.32 pounds ±0.13 pounds Metric: 0.60 kg ±0.06 kg Power Requirements (average) Mode RMS Current Power 12V (±10%) 5V (±5%) Read/Write 4 530 mA 850 mA 10.6 W Idle 510 mA 780 mA 10.0 W Standby 30 mA 300 mA 1.8 W Sleep 30 mA 190 mA 1.3 W Environmental Specifications 5 Shock Operating (2 ms) 30G (write), 65G (read) Non-operating (2 ms)6 250G Vibration Operating - Random - Linear 0.004 g2/Hz (10 to 300 Hz) 20-300 Hz, 0.75G (0 to peak) Non-operating - Linear 5-20 Hz, 0.195 inches (dbl amp) 20-500 Hz, 4.0G (0 to peak) Operating Temperature and Humidity Temperature 5°C to 55°C Humidity 5-95% RH non-condensing Thermal Gradient 20°C/hour (max) Non-Operating Temperature and Humidity Temperature -40°C to 65°C Humidity 5-95% RH non-condensing Thermal Gradient 30°C/hour Acoustics (average) Idle Mode 7 34 dBA Seek Mode 0 7 36 dBA Seek Mode 3 7 35 dBA Reliability Specifications Warranty 3 years 8 ------------------------------------ 1 Western Digital defines a megabyte (MB) as 1,000,000 bytes, and a gigabyte (GB) as 1,000,000,000 bytes. 2 Effective maximum transfer rate running Serial 1.0. 3 On reads and writes. 4 20% duty cycle. 5 No non-recoverable errors during operating tests or after non-operating tests. 6 Half sine wave measured in 2 ms duration, measured without isolation. 7 Sound power level. 8 Three-year standard warranty on WD Caviar Special Edition hard drives. This standard warranty may be subject to variations imposed by local law or regulations. 250 GB hard drive 200 GB hard drive 160 GB hard drive 120 GB hard drive Western Digital WD2500JD 250gb 7200rpm 8mb SATA