This is a hard disk drive from Western Digital. WD Caviar family provides the best combination of performance, reliability and value for today's entry-level and mainstream desktop systems. WD Caviar Enhanced IDE (EIDE) hard drives offer Ultra ATA, 5400 RPM spindle speeds, low seek times, high capacity and a 512 or 2048 KB cache buffer, all of which adds up to a fast data delivery system. And to protect your data, include Data Lifeguard, WD's exclusive automatic defect detection, and repair technology are included to enable our drives to actually fix themselves.

Product Description-WD Caviar WD200BB - hard drive - 20 GB - ATA-100,Type-Hard drive - internal,Form Factor-3.5" x 1/3H,Dimensions (WxDxH)-4 in x 5.8 in x 1 in,Weight-1.3 lbs,Capacity-20 GB,Interface Type-ATA-100,Data Transfer Rate-100 MBps,Average Seek Time-8.9 ms,Spindle Speed-7200 rpm,Buffer Size-2 MB,