WD Caviar High-Performance 7200 hard drives are the performance champions for advanced desktop personal computers. Rotational Speed: 7200 RPM Capacities: Up To 250 GB Interface: Ultra ATA/100 Average Read Seek Time: 8.9 ms Buffer Size: 2 MB Data Lifeguard: WD's exclusive hardware, software and services designed to protect your data. Product Dimensions 5.8 x 4 x 1 inches Item Weight 1.46 pounds Shipping Weight 1.5 pounds ASIN B00006HNZ1 Item model number WD400BB Customer Reviews 4.0 out of 5 stars 39 ratings 4.0 out of 5 stars