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ROM (Read Only Memory)
It is permanent in nature. It is non-volatile which means its contents remain even after the
computer is turned off. The information is coded at the time of manufacturing the computer.
The computer needs this information for its basic functions.
Read Only Memory
Secondary Memory
Secondary Memory provides extra storage where the data can be stored permanently for later use. It is also known
as external memory as it can be stored anywhere. Examples of secondary memory are compact disc, hard disk, flash
drive, etc.
Hard Disk
A Hard Disk stores and provides quick access to large amounts of data on an
electromagnetically charged surface or set of surfaces. Hard disks are generally fitted
inside the system unit. However, there are also external hard disks also available. A hard
disk is made-up of a collection of disks called platters stacked on a cylindrical rod. Each of
which, like phonograph records, has data recorded electromagnetically in concentric circles
or "tracks" on the disk. The capacity of a hard disk varies from a few Gigabytes to a few Hard Disk
hundred Terabytes.
CD
A compact disc is a small, portable, round disc made of molded polymer used for recording,
storing, and playing back audio, video, text, and other information in the digital form. It
was originally developed to store sound recordings exclusively, but later it also allowed the
preservation of other types of data. It stores data of low capacity upto 700 MB.
CD
DVD
Digital Versatile Disc is used for storing digital data using optical rays. It is the same size as a
CD, but has a larger storage capacity. They are commonly used to store large volumes of data
including audio and video files. It stores data upto 10 GB.
DVD
Blu-ray Disc
Blu-ray Disc is of the same dimension as that of CD or DVD and uses the same optical rays
technology for recording and playing back high-definition (HD) video and for storing large
amounts of data. It has a capacity of up to 25 GB.
Blu-ray Disc
Flash Memory
Flash drive functions as a portable hard drive. It's a small and portable memory card that plugs
into a computer's USB port. USB flash drives are smaller and more durable with large storage
capacity. It can be used in any computer with USB port. USB flash drives are also called thumb
drives, pen drives, key drives, or simply USB drives. It stores data upto 2 TB.
Flash Drive
ICT Skills-I 83

