Right side:

Left side

Right Side:

Left side:

All:

1. What do you understand about storage devices? What do they do?

2. Have you ever use secondary storage devices before? If yes, can you mention the devices that you use.

STORAGE DRIVES / MEDIA

referred to as:

storage, storage media, storage medium.

is a hardware device capable of

holding information.

Primary storage is the storage provided by memory in a

computer system e.g. ROM/RAM.

Secondary storage

is storage provided by peripheral devices other than memory

TYPES OF COMPUTER

STORAGE DEVICES

Secondary storage: is required in a computer system for three reasons.

1. The content of memory is usually volatile, which means that if power is disconnected the data is lost.

2. The capacity in megabytes of memory is limited.

3. Memory is more expensive than secondary storage.

TYPES OF COMPUTER

STORAGE DEVICES

TYPES OF COMPUTER

STORAGE DEVICES

Several types of disks may be used for Secondary storage.

Floppy disks Hard disks Optical disks (including CD-ROM, writeable CD, DVD External /portable Storage Devices

STORAGE DEVICES

A floppy disk is a low capacity disk which may be removed from the computer.

Those holding a small amount of data (typically 1.44 Mb

And Super floppies known as ZIP disks (typically 100 Mb)

Data may be written to and read from a floppy. A small notch can be used to make the disk read-only

Floppy Disk Drive

Floppy Disk Drive

STORAGE DEVICES

A hard disk is a higher capacity medium, with up to hundreds of gigabytes.

They are usually non-removable, but removable hard disks are becoming more common.

They can be both read from and written to, and are the standard medium for storage on computer systems today.

The storage capacity of a hard drive is measured in billions of bytes, or gigabytes (GB).

The speed of a hard drive is measured in revolutions per minute (RPM).

Multiple hard drives can be added to increase storage capacity.

STORAGE DEVICES

http://www.bestbuy.com/site/Computers-Promotions/-Hard-Drives-Types-and-Capacity-Guide/ pcmcat244100050004.c?id=pcmcat244100050004

STORAGE DEVICES

What can

you store?

Digital Music (Hours)

Digital Photos (Files)

Digital Videos (Hours)

DVD Quality (Movies)

HD Videos (Hours)

Capacity

320 GB up to 5,000 up to 100,000 up to 320 up to 80 up to 80

750 GB up to 12,000 up to 240,000 up to 750 up to 180 up to 180

1.0 TB up to 16,600 up to 320,000 up to 1,000 up to 250 up to 250

2.0 TB up to 33,320 up to 640,000 up to 1,000 up to 500 up to 500

3.0 TB up to 49,980 up to 960,000 up to 3,000 up to 750 up to 750

Average file

size using

camera's

highest-

resolution

JPEG mode

Based on

typical

2- hour

movie

Based on

H.264

compression

at 6.7Mbps

bitrate

uses lasers to read data on the optical media.

Three types of optical drives:

Compact Disc (CD),

Digital Versatile Disc (DVD) and

Blu-ray Disc (BD).

STORAGE DEVICES

CD, DVD, and BD media can be

pre-recorded (read-only),

recordable (write once),

or re-writable (read and write multiple times).

STORAGE DEVICES

Rotation speed and data transmission

a.k.a. as a thumb drive

a removable storage device connects to a USB port. An external flash drive uses the same type of non-volatile memory chips as solid state drives and does not require power to maintain the data.

STORAGE DEVICES

SUMMARY

ASSESSMENT ASSESSMENT:

Name: ______________________Year & Section: _____________ Date: __________

USSAGE / FUNCTION EXAMPLES

DEFINITION CAPACITY / SPEED

STORAGE MEDIA