1.5 TYPES OF PERIPHERAL DEVICES - STORAGE

Question 1

WHAT IS SECONDARY STORAGE?

Answer 1

Storing data for later use. Storing data on an app. Virtual memory - RAM

Question 1

WHAT IS A STORAGE DEVICE?

Answer 1

Stores data/software used in computer system. Internal / external.

Question 2

EXAMPLES OF STORAGE DEVICES?

Answer 2

• HARD DISK DRIVE
• SOLID STATE DRIVE
• OPTICAL DISK DRIVE

Question 3

HARD DISK DRIVE

Answer 3

Contains hard disk media. Provides connection from hard-disk to motherboard (wired/wireless)

Question 4

SOLID STATE DRIVE

Answer 4

Contains flash memory. Otherwise identical to HDD

Question 5

OPTICAL DISK DRIVE

Answer 5

Contains optical disk media. Newer drives are often compatible with older media. Uses backwards compatibility.

Question 6

WHAT IS BACKWARDS COMPATIBILITY?

Answer 6

Ability to be used with older technology without having to be specially adapted.

Question 7

STORAGE MEDIA

Answer 7

What you store inside drives.Can be written once or rewritten.

Question 8

WHAT ARE THE TYPES OF STORAGE MEDIA?

Answer 8

-Hard disks
-Optical media
-Flash media
-Magnetic tape

Question 9

HOW DO HARD DISKS WORK?

Answer 9

Made up of concentric platters. These platters make up a cylinder that spins on a central spindle. When spinning, read/write heads changes the magnetic field to electric currents. The amount of time taken depends on how fast the read/write head is moved across the tracks on the platter.

Question 10

WHAT ARE READ/WRITE HEADS?

Answer 10

They are part of a disk drive that passes across the platters on a very thin layer of gas above the platters.

Question 11

FEATURES OF HARD DISKS?

Answer 11

Fast data access speed up to 128GB. High cost per GB. Used in servers, personal computers, backups. NOT PORTABLE.

Question 12

FEATURES OF OPTICAL MEDIA?

Answer 12

Slow data access speed, Medium cost per GB. Used in multimedia (music, games, films), file backups. NOT PORTABLE.

Question 13

TYPES OF OPTICAL MEDIA?

Answer 13

-CDs
-DVDs
-BLU-RAY

Question 14

CDs

Answer 14

Can store up to 700MB of data. Data is written on disk using laser. Writes data to plastic layer beneath layers of aluminium and acrylic.

Question 15

DVDs

Answer 15

Can store up to 4.7GB on a single sided, single layer disk. On double sided, double layer stores up to 18GB. Data is written to DVDs using shorter wavelength of red laser light.

Question 16

BLU-RAY

Answer 16

Stores up to 25GB of data on single-sided, 50GB on double. Uses scratch protection coating. Violet laser lights are used to store data at greater density than red lights in DVD.

Question 17

FEATURES OF FLASH MEDIA?

Used in laptops, mobile phones

Answer 17

More energy efficient than hard disk because there is no moving parts. Less likely to fail. FASTEST data access speed. Maximum capacity up to many TB. VERY HIGH cost per GB. Portable.

Question 18

FEATURES OF MAGNETIC TAPE?

Answer 18

Originally designed to record sound, now stores data. SLOWEST data access speed. Maximum capacity up to 185TB. Low cost per GB. Used in whole system backups, archives. NOT portable.