Hard disc

It store several programs, documents , database,etc. It is the computer's permanent storage unit. It can hold large amount of data. It can also hold large amount of programs.Unlike data held in RAM the information on the hard disc is not affected even though the computer's power is switched off. The stored item is permanent until you instruct to delete it.

The hard disc is like a CD rotating inside a cd rom. but its different. It can have large amount of data in it. The number one manufacturer of hard disc is SEAGATE. this is best as of me. they have given number one position for a company which deserve it.

I personally feel it. And another competitor of SEAGATE is WD (Western Digital). It is also an good company. the capacity of hard disc is given with bits. this bits are sub units of bytes. 8 bit equals 1byte. 1024 bytes equals 1Kilo Bytes. 1024 kilobytes equals 1 Mega Byte. 1024 Mega Byte equals 1 Giga Bytes.1024 Giga Bytes equals 1 Tera Bytes and so on.

Computer System - General

Computer is an electronic component contains various parts combined to it. It is mostly divided into Hardware and Software. Hardwares are referred as physical components and Softwares which runs several components. Computer is a latin word derived from "computare" which means 'to compute' or 'to calculate'. Olden day computers are used for calculations but today it enters wide fields and making remarkable differences with it.
The basic operations of a computer is input, output and process. Computer has got memory to store datas. computer system has following components in it. Main component of a computer system is processor. It is placed with mother board,where all the sub components are placed. Monitor is an output device which shows the output to the user. printer is also an output unit, which prints data in papers.
Nowadays when you going to assemble a system you need following components.
1. Mother Board
2.Processor
3.Ram
4.SMPS
5.Hard disc
6.CD or DVD rom
7.Monitor
8.Speakers
9.Printer
10.Scanner
11.cabinet
12.Floppy Drive
13.UPS

Each and Every component is explained in future posts.