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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
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