Computer Memory

Classification-of-Computers
► What is a Computer
► How is data stored in computers
► Computer Memory

Computer is a machine that can perform calculations automatically. It is an electronic device that manipulates data. You can use a computer to listen to music, watch movies, type letters and use the Internet.
Data is a collection of facts and information.
Processing is an act of changing the given data into a more useful form by applying a sequence of operations.
Output is the final result which is obtained after the processing of data.
Speed: The computer works at a great speed. It can do billions of calculations in few seconds.
Memory: Computers can store a large amount of data safely in their memory for future use. That is why they are very useful machines.
Accuracy: The computer is a very accurate machine. It does not make mistakes.
Diligence: It can do the same job again and again without getting tired or bored.
Versatile: The computer can perform different types of jobs.
Multitasking: The computer can do different jobs at the same time.
Computer Memory: When you give input to the computer it goes into the computer's memory. The memory of a computer is divided into two categories.
1. Primary memory
2. Secondary memory

Primary Memory: Primary memory is known as the main memory of the computer. It stores programs and data which are required by the CPU. It is fixed on the motherboard inside the CPU cabinet. There are two types of primary memory.

Secondary Memory: Secondary Memory is permanent storage memory. It allows to change, print, copy, move or delete data whenever required. You can also carry data from one place to another using secondary memory. Hard disk, compact disc, DVD and pen drive are some storage devices of a computer.

Hard Disk: A hard disk is also called a fixed disk. It is made of metal plates fixed on a spindle. These plates are coated with magnetic material. A hard disk can store very large amounts of data and is fixed inside the CPU box. Hard disks are generally available in 80 GB, 120 GB and 1 TB capacities. Hard disk has a larger storage capacity as compared to other storage devices.

DVD: The full form of DVD is Digital Versatile Disc or Digital Video Disc. It is very similar to a CD but can store much more data, approximately 17 to 21 GB. A single DVD can store many cartoon movies. A DVD is inserted into a DVD-Drive.

Pen Drive: It is a pen like device. This device is attached outside the computer at a place called the USB port. USB pen or Flash drives come in handy if you have to transfer data between different computers on a regular basis. Additionally, a USB flash drive is fast, portable, durable and reliable. It can store large amounts of data ranging between, 1 GB, 2 GB or more. It is the most convenient device to carry data from one place to another as we can put it inside our pockets.