Information and Communication Technology

2.1.11 External storage unit

The purpose of external storage is to retain data and programs for future use. For example, a program may be required at regular intervals. If such information is stored in an external storage media, then one can retrieve it as and when necessary, thus avo iding repeated typing. Any number of files containing information can be stored on external media. Since they are permanent (they are not erased when the power is turned off) we can store long files on external media, and later on work on them in sections, keeping all the sections in storage except the one currently in use.