Computer Storage Memory Explained

Computers use memory to store data currently in use and the data needed to operate the computer. Computers also use storage devices, such as hard drives and external storage, to store documents, music, pictures and other data. Types of memory
Read-Only Memory (ROM) contains the data necessary to operate the computer. This data normally cannot be changed. Random Access Memory (RAM) holds volatile data created by programs and documents in use. RAM cannot store data permanently, but it retains the data while the computer is on.

Types of storage
Computers save data, such as programs, text documents and photographs, to the hard drive. Many computer users also use portable data storage, such as pen drives and portable hard drives, to transport data from one computer to another or to back up data in case of hard drive failure.
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Computer memory capacity and storage capacity are measured in bytes, abbreviated “B” Common units of bytes include megabytes (MB), which equates to about 1 million bytes, and gigabytes (GB), which equates to about 1 billion of bytes .

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