What is ROM? | Types of ROM


ROM is a non-volatile primary storage device that is used to store data permanently. It stands for Read Only Memory. It is non-volatile because the data stored in ROM remain there even after no power supply. ROM is usually used to store firmware. If you have ever installed Operating System, then you might know about BIOS. Software like BIOS is called firmware. This software is installed on ROM to give control of hardware to the user. You can find ROM on many devices like smartphones, laptops, desktop computers, cameras, tablets, etc.

Types Of ROM(Read Only Memory)

There are usually three types of ROM. They are: PROM, EPROM, and EEPROM.

PROM(Programmable Read Only Memory)

PROM stands for Programmable Read Only Memory. In PROM, once the program is programmed and stored, it can't be changed. For example: BIOS software.

EPROM(Erasable Programmable Read Only Memory)

EPROM stands for Erasable Programmable Read Only Memory. In EPROM, reprogramming is possible. But to erase the data from EPROM, it should be exposed to ultraviolet light.

EEPROM(Electrically Erasable Programmable Read Only Memory)

EEPROM stands for Electrically Erasable Programmable Read Only Memory. In EEPROM, the data can be reprogrammed, can be erased without the need for ultraviolet light.


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