Random-access memory (RAM) is a form of data storage. A random-access
device allows stored data to be accessed in very nearly the same amount
of time for any storage location, so data can be accessed quickly in any
random order. In contrast, other data storage media such as hard disks,
CDs, DVDs and magnetic tape, as well as early primary memory types such
as drum memory, read and write data only in a predetermined order,
consecutively, because of mechanical design limitations. Therefore the
time to access a given data location varies significantly depending on
its physical location.
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