FEATURES Storage capacity: The storage capacity of this hard drive is 20 GB. Interface: Use the IDE interface, which was one of the first connection interfaces for hard drives before the advent of the SATA interface. The IDE interface is less common in modern computers, but can still be used in more dated or specialized systems. Rotating speed: This hard drive has a rotation speed of 5,400 RPM (Rotations Per Minute). A faster rotation offers better performance but can generate more heat and consume more energy. Cache: The Seagate ST320413A probably includes a variable-sized cache to improve data reading and writing performance. Format: It is designed for mounting in 3.5-inch housings, which is a common standard for desktop computer hard drives. Reliability: Seagate is known to produce reliable units and the ST320413A should offer a reasonable level of reliability and durability. Compatibility: It is compatible with a wide range of desktop systems that support the IDE interface. Physical dimensions: The physical size of the hard drive is standard for a 3.5-inch hard drive.