| Secondary Storage |
Article Index for Secondary |
Website Links For Secondary |
Information AboutSecondary Storage |
| CATEGORIES ABOUT SECONDARY STORAGE | |
| computer storage | |
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In Computer Storage , secondary storage, or '''external memory''', is Computer Memory that is not directly accessible to the Central Processing Unit of a Computer , requiring the use of computer's Input/output channels. Secondary storage is used to store Data that is not in active use. Secondary storage is usually slower than Primary Storage , or internal memory, but also almost always has much higher capacity-to-cost ratio and is Non-volatile , which makes it perfect for the preservation of stored information in an event of power loss. Storage devices in this category include:
Almost all storage devices are either Magnetic or Optic . A well known exception is provided by Flash Memories (used in Digital Audio Players , Usb Stick Memories , etc.) which uses a different approach. The secondary storage is often formatted according to a Filesystem format, which provides the abstraction necessary to organize data into Files and Directories , providing also additional information (called Metadata ) describing the owner of a certain file, the access time, the access permissions, and other information. |
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