用英语介绍ram和rom的区别

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  • Read-only memory or ROM is a form of data storage in

    computers and other electronic devices that can not be easily altered or

    reprogrammed. RAM is referred to as volatile memory and is lost when

    the power is turned off whereas ROM in non-volatile and the contents are

    retained even after the power is switched off.

    Random Access Memory or RAM is a form of data

    storage that can be accessed randomly at any time, in any order and from

    any physical location in contrast to other storage devices, such as

    hard drives, where the physical location of the data determines the time

    taken to retrieve it. RAM is measured in megabytes and the speed is

    measured in nanoseconds and RAM chips can read data faster than ROM.