Page 27 - Computer Class 07

CD-ROM

A CD-ROM, a type of recordable CD, is an optical

secondary storage device invented by Sony and
Philips. It is also known as a WORM– Write Once
Read Many Medium.

CD-ROM
Hard Disk Drives

Computers rely on hard disk drives (HDDS) to store

data permanently. They are storage devices used to
save and retrieve digital information that will be
required for future reference.

Hard drives are non-volatile, meaning that they retain
data even when they do not have power. The

information stored remains safe and intact unless the
hard drives is destroyed or interfered with.
Hard Disk Drive
The information is stored or retrieved in a random
access manner as opposed to sequential access. This implies that blocks of data can
be accessed at any time they are required without going through other data blocks.

USB Drive

A USB flash drive (based around Universal Service Bus technology) is a compact,

lightweight and micro portable data storage device. The increasing mobility of users
such as independent tech consultants, academicians, working professionals and
others has led to the increased use and popularity of flash drives. Depending on
usage, user characteristics and needs, USB drives can be used for different purposes.

USB-Drive

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