Storage Devices by Dinesh Thakur Category: Memory As we know that the Main Memory Stores the data in a Temporary Manner means all the data will be loss when the Power switched off. And all the data will be loss when the power goes switched off. So that we uses the Secondary Storage devices those are used for Storing the data in a Permanent Manner means all the Data will remain Stored whether the Power is Switched on or Switched off means the Power Will never effect on the System.
Why Secondary Storage Devices are Used? Secondary storage devices are used because: Primary memory RAM is volatile and temporary. When computer is switched off, all data in ram is erased. Storage devices can store large amounts of data and instructions permanently whereas Primary memory has less capacity of storing data.
Types Of Storage Devices There are three main types of storage devices: Magnetic Tape Magnetic tape is the oldest storage device. It is made of plastic coated with magnetic material. Data is stored on magnetic tape in the form of magnetic spots. Tape drive is used to read and write data on tape.
Magnetic disk is sequential access device.
It is slower device than magnetic disk or optical disk. Magnetic tapes are used in reels of different lengths, for example, feet etc. Magnetic Disk A magnetic disk is a thin circular metal or plastic disk coated with magnetic material.
Data is stored in the form of magnetic spots. Magnetic disk is random access device. It is faster than magnetic tape. There are three main types of magnetic disk: Hard Disk The hard disk is also called fixed disk.
It consists of one or more metal plates. The plates are fixed in the drive. Metal plates are coated with magnetic material to store data. A motor rotates disks. Following are major characteristics of hard disk: Operating system divides the disk into circles called tracks.
Each track is divided into pie-shaped areas called sectors. Data is stored in sectors. Each sector can store bytes. Floppy Disk Floppy disk is a small plastic plate coated with magnetic material.
Data is stored in magnetic spots. Main advantage of floppy disk is that it is used to transfer data from one computer to another.
Floppy disk drive is used to read and write data on floppy disk. Floppy disk is available in two sizes: It is covered in a hard plastic cover. When disk is inserted into disk drive then shutter is automatically opened.
It can be write protected by a notch.Write detail note on secondary storage devices? Secondary storage (also known as external memory or auxiliary storage), differs from primary storage in that it is not directly accessible by the CPU. The computer usually us es its input/output channels to access secondary storage and transfers the desired data using intermediate area in primary .
Secondary storage devices: These usually have large storage capacity, and they store data permanently. They can be either internal or external to the computer, and they include the hard disk, optical disk drive and USB storage device.
Storage devices are also called secondary storage devices / backing storage devices / external storage devices or auxiliary storage devices. Examples of storage devices include Hard Disk, CD and DVD etc. ANSWER Secondary storage devices are not limited to USB pens. There are also, external hard drives, tape drives, jazz drives, scsi drives, cd's dvd's etc.
Input and Output Devices by Dinesh Thakur Category: Memory The devices which are used to input the data and the programs in the computer are known as " Input Devices ".
or Input device can read data and convert them to a form that a computer can use. Write a short note on following: Basic, Magnetic and Optical storage devices.
Basic Storage Devices: Basic Storage devices: The following are some examples of types of storage devices used with computers.