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2.5.5 Storage (Optical Disc (Digital Video Disc (DVD) (A type of optical…
2.5.5 Storage
Optical Disc
consists of flat, round,
portable disc made of metal, plastic and
lacquer that is written and read by a laser
Stores data in deformities on the surface of a
circular disc and reads this data by
illuminating the surface with a laser diode and
observing the reflection
Compact Disc (CD)
A type of optical disc used to store data,
songs, drivers, and program files.
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Digital Video Disc (DVD)
A type of optical disc used to store videos,
films, and large programs.
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Types of DVD:
– DVD-ROM, DVD-R, and DVD-RW
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Flash Memory Storage
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More durable and shock resistant than other
types of secondary storage because it contains
no moving parts
-
Memory card
• Flash memory storage that users insert and remove
from a slot in personal computer, smartphone, digital
camera, or card reader/writer.
• Examples: CompactFlash, microSD, Memory Stick Micro
Solid state drive (SSD)
• Flash memory storage that offers faster data transfer
rate, used in all types of computers and mobile devices.
• May eventually replace storage media with moving
parts such as hard disk and optical disc
Characteristics
-
has bigger capacity compared to
memory, which has limited capacity
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Magnetic Storage
Devices that store data in the form of tiny
magnetised dots. These dots are created, read
and erased using magnetic fields created by
very tiny electromagnets.
Hard Disk
Storage device that contains one or more
inflexible, circular platters that use magnetic
particles to store data, instructions and
information
stores operating system, application
software, users’ data and information, and
backup
Characteristics
– Capable to store large amount of data.
– Direct access device; a file can be access
randomly, not following the sequence it is stored.
– Faster data access compared to tape
Tape
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Characteristics
– Capable to store large amount of data.
– Sequential access device; a file have to be
accessed in sequence.
– Slower data access compared to hard disk
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store data, instructions, and
information permanently