Computer data storage – link to Read

It is not possible to add the new link because it would replace an existing, longer link.

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Generally, the lower a storage is in the hierarchy, the lesser its [[Bandwidth (computing)|bandwidth]] and the greater its access [[latency (engineering)|latency]] is from the CPU. This traditional division of storage to primary, secondary, tertiary, and off-line storage is also guided by cost per bit.

In contemporary usage, ''memory'' is usually fast but temporary [[semiconductor memory|semiconductor]] [[~~random-access memory|read-write~~ memory]], typically [[DRAM]] (dynamic RAM) or other such devices. ''Storage'' consists of storage devices and their media not directly accessible by the [[CPU]] ([[Secondary storage|secondary]] or [[tertiary storage]]), typically [[hard disk drive]]s, [[optical disc]] drives, and other devices slower than RAM but [[non-volatile]] (retaining contents when powered down).<ref>''Storage'' as defined in Microsoft Computing Dictionary, 4th Ed. (c)1999 or in The Authoritative Dictionary of IEEE Standard Terms, 7th Ed., (c) 2000.</ref>

In contemporary usage, ''memory'' is usually fast but temporary [[semiconductor memory|semiconductor]] [[read–write memory]], typically [[DRAM]] (dynamic RAM) or other such devices. ''Storage'' consists of storage devices and their media not directly accessible by the [[CPU]] ([[Secondary storage|secondary]] or [[tertiary storage]]), typically [[hard disk drive]]s, [[optical disc]] drives, and other devices slower than RAM but [[non-volatile]] (retaining contents when powered down).<ref>''Storage'' as defined in Microsoft Computing Dictionary, 4th Ed. (c)1999 or in The Authoritative Dictionary of IEEE Standard Terms, 7th Ed., (c) 2000.</ref>

Historically, ''memory'' has, depending on technology, been called ''central memory'', ''core memory'', ''core storage'', ''drum'', ''main memory'', ''real storage'', or ''internal memory''. Meanwhile, slower persistent storage devices have been referred to as ''secondary storage'', ''external memory'', or ''auxiliary/peripheral storage''.

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 Generally, the lower a storage is in the hierarchy, the lesser its [[Bandwidth (computing)|bandwidth]] and the greater its access [[latency (engineering)|latency]] is from the CPU. This traditional division of storage to primary, secondary, tertiary, and off-line storage is also guided by cost per bit.
-In contemporary usage, ''memory'' is usually fast but temporary [[semiconductor memory|semiconductor]] [[random-access memory|read-write memory]], typically [[DRAM]] (dynamic RAM) or other such devices. ''Storage'' consists of storage devices and their media not directly accessible by the [[CPU]] ([[Secondary storage|secondary]] or [[tertiary storage]]), typically [[hard disk drive]]s, [[optical disc]] drives, and other devices slower than RAM but [[non-volatile]] (retaining contents when powered down).<ref>''Storage'' as defined in Microsoft Computing Dictionary, 4th Ed. (c)1999 or in The Authoritative Dictionary of IEEE Standard Terms, 7th Ed., (c) 2000.</ref>
+In contemporary usage, ''memory'' is usually fast but temporary [[semiconductor memory|semiconductor]] [[read–write memory]], typically [[DRAM]] (dynamic RAM) or other such devices. ''Storage'' consists of storage devices and their media not directly accessible by the [[CPU]] ([[Secondary storage|secondary]] or [[tertiary storage]]), typically [[hard disk drive]]s, [[optical disc]] drives, and other devices slower than RAM but [[non-volatile]] (retaining contents when powered down).<ref>''Storage'' as defined in Microsoft Computing Dictionary, 4th Ed. (c)1999 or in The Authoritative Dictionary of IEEE Standard Terms, 7th Ed., (c) 2000.</ref>
 Historically, ''memory'' has, depending on technology, been called ''central memory'', ''core memory'', ''core storage'', ''drum'', ''main memory'', ''real storage'', or ''internal memory''. Meanwhile, slower persistent storage devices have been referred to as ''secondary storage'', ''external memory'', or ''auxiliary/peripheral storage''.

Computer data storage – link to Read–write memory