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ROM (Read-Only Memory)

• ROM is a type of primary memory in a computer.

• It has important instructions that help the computer
start up when you turn it on.

• The data in ROM is permanent – it is not erased when

the computer is turned off.
• We cannot change or delete the information in ROM easily.

Types of ROM:

PROM (Programmable ROM)

Data can be added only once after making it.

Once written, it cannot be changed or erased.

EPROM (Erasable Programmable ROM)

The data can be erased using ultraviolet (UV) light.
After erasing, it can be reprogrammed.

EEPROM (Electrically Erasable Programmable ROM)

Play and Learn

1. Name the device used to convert soft copy into hard copy.

2. 1024EB is equal to how many?

Secondary Storage Devices

CD/DVD

• CD (Compact Disc): Stores about 700 MB of data, used mostly for songs or small
files.

• DVD (Digital Versatile Disc): Looks like a CD but can store much more data (about

4.7 GB or more), often used for movies and larger files.

Computer — 4 10