Tags: Genre, Music Genre, Topical Concept.
Hierarchical storage management (HSM) is a data storage technique which automatically moves data between high-cost and low-cost storage media. HSM systems exist because high-speed storage devices such as hard disk drive arrays are more expensive (per byte stored) than slower devices such as optical discs and magnetic tape drives. While it would be ideal to have all data available on high-speed devices all the time this is prohibitively expensive for many organizations.