Memory (Storage Unit)
Memory (Storage Unit) – The basic function of this unit to store the data, instructions and final results in the system so that it can deliver them on demand to the user or other computer units at a later time. The data and instructions are transferred to other computer units or devices from the main storage under the supervision of the control unit. It also referred to as Primary Storage.
Primary storage is a direct access storage device, consisting of a number of storage locations. Each location in the store has a unique number, called Storage Address. The system assigns a unique location for each data element. Once the data is assigned to the location, the system accesses it directly by means of the address of the particular storage locations.
The various types of primary Storage are –
- RAM (Random Access Memory)
- ROM (Read Only Memory)
- Cache Memory
- Virtual Memory
The data and instructions in Primary Storage (RAM) are temporary in nature and they are erased automatically as soon as the power is switched off. The user can access the data from secondary storage whenever required.
Some commonly used secondary storage devices that are used to store the data permanently are –
- Floppy Disk
- Hard Disk
- Compact Disk
- Magnetic Tape
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