The Western Digital WD400 Caviar Enhanced IDE Hard Drive is a high-performance internal desktop drive with a storage capacity of 40GB. It boasts a rotation speed of 7200 RPM, a read speed of 500MB/s, and a transfer rate of 300 Mbps. This HDD is designed for use with laptops and PCs, featuring a sleek black color and a low noise level. With a cache size of 2MB and a form factor of 3.5 inches. Brand new factory sealed in package.