Broadly speaking, the cache exists on many computer accessories, such as CPU-cache, cache, and even third-tier caching, disk cache, optical drive also has cache. Application of cache technology, to upgrade the hardware data read from and processing speed. Hard disk cache (Cache memory) is a memory chip on the hard drive controller, with extremely fast transfer speeds, it is internal storage and buffer between the external interface for hard disks.
Due to internal data transfer rate of your hard disk and external interface transmission speed, cache in which you play the role of a buffer. Cache size and speed is an important factor directly relates to the transfer speeds of the hard drive, can greatly improve the overall performance of your hard disk. When hard disk access to fragmentary data needs to be exchanged between the hard disk and memory data, if you have large caches, you can cache those sketchy data exist, and reduce system load, and improves data transfer speeds.