Random Access Memory (RAM) – Storage Device
Computer data storage is done by volatile type of memory called as random access memory. RAM is composed of integrated circuits that allow any stored data to be accessed in random order. This in turn only implies that any data can be accessed from any location even if it is irrelevant to the subject that is presently being processed. Almost all the RAM is called as writable RAM. There are two types like static RAM and dynamic RAM. In SRAM the data are stored in a flip-flop state and in a DRAM it is stored as a charge in a capacitor. There are also different circuitries that are able to detect and sometimes correct random faults these are called as memory errors with the help of error correction codes.
By the usage of RAM the information is lost when the power goes off thus it is called volatile type of memory. This limitation is overcome in some electronic devices by use of flash memory. When RAM is over used, there are back up system on the hard drive of computers. This performs an operation called swapping and the hard drive can be used as an additional working memory.
New types of non-volatile RAM are being discovered so as to make it useful even during power failure. In recent computers the RAM comes in a type of modules called as memory modules or DRAM modules. RAM is also used in other physical devices like writable and readable discs namely DVD-RAM. Many other types of Random Access Memory are ROM and NOR-Flash.
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