![]() Due to the fact that magnetic disk storage has declined in price at a much more rapid pace than optical storage, the incentive to establish such hierarchies has lessened.Ī table characterizing available technologies based on speed, capacity, and cost may be viewed by clicking on Table: Comparison of Storage Media When magnetic disk storage was very expensive, it was common to place the highest usage files on magnetic disk (online access), less frequently used files on less expensive (and slower) optical media (near line storage) and very infrequently accessed files on magnetic tape (offline storage). Storage hierarchies refer to the allocation of files to different kinds of storage depending on the frequency of use. Network File System or Common Internet File System), or part of a storage system that functions independently of any particular server (e.g. Network attached storage generally encompasses storage that is accessible to multiple computers and may be either connected to a server and accessed via special file system protocols (e.g. Direct attached storage includes standard desktop drives that are either installed within a computer case or cabled directly to it. ![]() Storage systems are also distinguished as either direct attached storage or network attached storage. The underlying storage system (magnetic, optical or magneto-optical), the drive type (fixed or removable), the media material (tape, rigid platter, flexible platter), and the hardware interface (ATA, ATAPI, SCSI, USB, Firewire/IEEE 1394, Fibre Channel) jointly define the characteristics of each technology. ![]() Mass storage technologies can be classified in several ways.
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