SUBJECT : INFORMATION TECHNOLOGY

TEACHER : SIR ZEESHAN ABBAS

Group Presentation:- Members:-

ANIS-UR-REHMAN SHAH (1421-315229) NOUMAN ZIAFAT (1421-315225) NOUMAN AKBAR (1421-315238) UMER MAQBOOL (1421-315226) TAMRAIZ SADIQUE ( 1421-315 ABDUL MANAN (1421-315

CHAPTER : 07

"Storage and Communication Hardware"

Presentation Contents:-

Hard & Floppy Disks Disk Storage Removable & Fixed

Disks Disk Controller Optical disk storage Recordable disk Ram Drives

Data Transmission Modes

Read Only Disks Mass storage Erasable Disks Tape Cartridges Flash Memory

Data Transmission Modes

Transmission is a process of sending and propagating. There are three ways, modes for transmitting data from one point to another. These are simplex, Half-duplex and full-duplex.

Transmission modes

• Simplex signal transmitted in one direction

e.g. Television. • half duplex both stations transmit, but only one at a time

e.g. police radio.• Full duplex

simultaneous transmission e.g. telephone.

Hard and Floppy Disks

Hard disks: Hard disk provides users with fast access

to stores data. Storage capacities can exceed to 1 billion bytes (gigabyte). Hard dish comes in variety of sizes.

Hard and Floppy Disks

Floppy Disks: Floppy disks, or diskettes, are round,

flat, flexible pieces of plastic used primarily for data storage and back up in personal computer system.

Disk Storage

Disk Storage: Disk drives store data on disks in

concentric circles called disk tracks.

Removable & Fixed Disks

Removable Disks: Disks packs can be inserted

into a disk drive for temporary use.

Removable & Fixed Disks

Fixed Disks: Fixed disks are built inside the

computer case and sealed from the outside environment to protect the disk.

Disk Controller

Disk Controller: A hard disk controller (HDC) is an

electrical component within a computer hard disk that enables the processor or CPU to access, read, write, delete and modify data to and from the hard disk.

Optical disk storage

Optical disk storage:Optical storage techniques

used by computers are basically the same as those used to record music on compact disks. Optical disks differ from magnetic-disk storage. A laser beam is used to write and read data.

Recordable disk

CD-R discs are blank CDs that can record data written by a CD burner. The word "recordable" is used because CD-Rs are often used to record audio, which can be played back by most CD players. However, many other kinds of data can also be written to a CD-R

RAM Drives

Flash Memory

Tape Cartridges

Erasable Disk