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Solid-State Disk (SSD)
A Solid-State Disk (SSD) is similar to a hard disk but has no moving

parts. Its read and write speed is significantly faster than that of a
standard hard disk. It can be installed within the CPU box or linked

externally. SSD storage capacities range from 128 GB to 30 TB.

CD, DVD and BD

A Compact Disc (CD) can store a small amount of information, such as videos, music,
and documents. A CD typically has a storage capacity of 700 MB. A Digital Versatile Disc
(DVD) can store more data than a standard CD. A DVD’s storage capacity ranges from
4.7 GB to 25 GB. DVD drives can read and write data from both DVDs and CDs. A Blu-
ray Disc (BD) can store a large amount of data and is written with laser technology. A

Blu-ray disc’s storage capacity is typically between 25 GB and 100 GB. It is used to save
high-resolution videos and movies.

Compact Disc (CD) DVD drive Blu-Ray Disc (BD)

USB Flash Drive
A USB Flash Drive, also known as a Pen Drive, is a portable storage
device. It is used to save and transfer music, video, and data files

across computers. Its capacity ranges from 8 GB to 2 TB.

Memory Card

A Memory Card is a tiny digital storage device. It is used in portable
electronic devices such as digital cameras, mobile phones, MP3 players,
and video game consoles. Its storage usually ranges from 2 GB to 256 GB.

TERTIARY STORAGE DEVICES

Tertiary storage devices store data which is used to review or restore data after a system
breakdown. These devices are typically used for archiving and backing up enormous
amounts of data.

Magnetic Tape

A magnetic tape is made of a long ribbon of plastic which has
been coated with a magnetic material. Magnetic signals are used
to record data on tape. It is used to store audio and video files.

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