Description:  Also called Mass Storage, "the storage of large amounts of information in a persisting and machine- readable fashion. Traditionally the term referred to computer data storage. Today the term acquired a broader meaning to incorporate musical, video, etc., data which may be read with devices other than computers. Storage media for mass storage include hard disks, floppy disks, flash memory, optical discs, magneto-optical discs, magnetic tape, drum memory, punched tape (historic) and holographic memory (experimental). Mass storage includes devices with removable and non-removable media. " http://en.wikipedia.org/wiki/Mass_storage . The physical and virtual(software) storage systems can impact the discovery teams ability to search and retrieve ESI through such factors as access speed, rights, location, critical usage restrictions and raw volume of storage.