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Depends on what you mean by "primary".

Main memory is a term that mostly applies to RAM.

Primary memory can mean the same thing I guess.

Secondary storage usually refers to non-volatile devices, like a hard drive, which retain the digital data(bits)in sectors even when the computer is off.

ROM is a different story, and is usually burned program code sold as firmware that retains program instructions only closely tied to specific hardware or purposes, and usually doesn't change much, nor acts like a secondary storage device.

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12y ago

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