Excellence Publication Co. Ltd.Volume 1 2.6 1

Volume 1Volume 1

Excellence Publication Co. Ltd.Volume 1 2.6 2

A. Magnetic Tape DrivesA. Magnetic Tape Drives used to read data from and write data onto

magnetic tapes

Two examples of magnetic tapes

Excellence Publication Co. Ltd.Volume 1 2.6 3

B. Floppy Disk DrivesB. Floppy Disk Drivesused to read data from and

write data onto magnetic disks

Plastic Jacket

Disk

Sliding Metal Shutter

Flexible Circle of Magnetic Material

storage capacity is 1.44MB

Excellence Publication Co. Ltd.Volume 1 2.6 4

C. Superfloppy Disk DrivesC. Superfloppy Disk Drives

used to read data from and write data onto magnetic disks

the storage capacity of a superfloppy disk can be of hundreds of megabytes

Excellence Publication Co. Ltd.Volume 1 2.6 5

D. Optical Disk DrivesD. Optical Disk Drives

used to read data from and write data onto optical disks

Laser beam reflected at a land or pit

Laser beam encounters a transition

Excellence Publication Co. Ltd.Volume 1 2.6 6

Types of CDs and DVDs Features Types of CDs and DVDs Features

Audio CDs, CD-ROMs and DVD-ROMs

CD-Recordables and DVD-Rs

CD-Writables, DVD-RAMs and DVD-RWs

Data is recorded at the time of manufacture and cannot be erased then.

Data can be recorded in the user environment once and cannot be erased then.

Data can be recorded again and again over in the user environment.

Different Types of CDs and DVDsDifferent Types of CDs and DVDs

Excellence Publication Co. Ltd.Volume 1 2.6 7

E. Magneto-optical (MO) Disk DrivesE. Magneto-optical (MO) Disk Drives used to read data from and write data onto

MO disks

a rewritable optical disk

Excellence Publication Co. Ltd.Volume 1 2.6 8

F. Hard Disk DrivesF. Hard Disk Drives used to read data from

and write data onto hard disks

there are two types of interfaces used by hard disk drives:

The Integrated Drive Electronics (IDE)

The Small Computer System Interface (SCSI)

hard disk drives are less portable than other storage devices

Excellence Publication Co. Ltd.Volume 1 2.6 9

Secondary Storage Devices Technique Type(s) Access Secondary Storage Devices Technique Type(s) Access

Magnetic

Magnetic

Magnetic

Optical

Magnetic & Optical

Magnetic

Sequential

Random

Random

Random

Sequential/Random

Random

Magnetic Tape Drives

Floppy Disk Drives

Superfloppy Disk Drives

Optical Disk Drives

MO Disk Drives

Hard Disk Drives

The features of different secondary storage devicesThe features of different secondary storage devices

Excellence Publication Co. Ltd.Volume 1 2.6 10

There are different types of There are different types of

secondary storage devices. secondary storage devices.

Suggest two examples and Suggest two examples and

compare their differences.compare their differences.

Excellence Publication Co. Ltd.Volume 1 2.6 11

BackBack