Why secondary memories are needed for computer?
|Subject||Introduction to Computer System|
|NU Year||Set: 4.(c) Marks: 4 Year: 2009|
Why secondary memories are needed for computer
Secondary memory is where programs and data are kept on a long-term basis. Common secondary storage devices are the hard disk and optical disks.
The hard disk has enormous storage capacity compared to main memory.
The hard disk is usually contained inside the case of a computer.
The hard disk is used for long-term storage of programs and data.
Data and programs on the hard disk are organized into files.
A file is a collection of data on the disk that has a name.
Secondary storage therefore needed because it is non-volatile, meaning it retains its contents without the need for a power supply. It also has the large storage capacity needed to store the operating system and all the programs and files needed by a modern computer system