Optical Disk

• Optical Disk :-

                                        Laser is used to read and write data on Optical Disk. To save data on disk laser beam creates small holes on disk. Optical drive laser beam able to read the holes on disk. The presence of holes indicates 1 and absent indicates 0. 

Optical technology work fast then a magnetic method. 

• Types of Optical Disk :-

1). CD :-

                

                      A CD ROM an acronym of " Compact Disc Read Only Memory " is a pre-pressed  compact disc that contains data accessible to, but not writable.

 CD ROM are popularly  used to distribute computer software, including video games and multimedia applications, through any data can be stored (up to the capacity limit of a disk.


2). DVD :-

                 DVD ROM stands for " Digital Versatile Disc Read only Memory " and refers to a drive that can read dvd discs. The advent of DVD ROM drives has made it easier for computers users to access large amounts of data as well as providing a medium for watching videos. DVDs can hold many times of the storage of a CD.

 So, Computer applications that required four or five CDs should be consolidated into a single disc. Video and commercial movies could be played on the computer as well. 

Hard Disk

• Hard Disk :-

 

                             Hard disk drive is a type of magnetic disk. It consisit round plates called platter. Data store on platter A head fix on plates to read and write data. Platters usually constructed of aluminum or glass which cannot be bent like floppy disc hence termed as hard disk. A hard disk drive normally has one head per platter with all heads mounted on common rack. The had disk spins the disk as 3600, 5400, and upto 7200 or even more RPM (rotation per minute).  We save a lot of data on hard disk. Hard disk is used in computers to save the important data. 

• Basic Hard Drive Components:

• Disk Platters
• Read/Write head
• Spindle motor
• Head actuator mechanism
• Logic Board
• Cable and Connectors
• Configuration items

• Sector in Hard Disk :-

                          Sector is a section of a tracks which stores a predetermined number of Bytes

Floppy Drive

•  Floppy Disk :-

                    Floppy disk is a data storage medium that is composed of a disk of thin, flexible (''floppy'') magnetic storage medium sealed in a square or rectangular plastic carrier lined with fabric that removes dust particles. Floppy disks are  read and written by a floppy disk drive.

• In average floppy disk memory is '' 1.44 MB '' 

Magnetic Disk

Dear Member,

     This is our first post related to Storage Devices Session...

In this post we tell you about the knowledge of Magnetic Disk and its importance...

SO FRIENDS LETS START OUR LESSON

• Magnetic Disk :-

               A memory device, such as floppy disk, or a removable cartridge, that is covered with a magnetic coating on which digital information is stored in the form of microscopically small, magnetic needles. The disk surface is divided into concentric tracks (circles within circles). The thinner the tracks, the more storage. The data bits are recorded as tiny magnetic spots on the tracks. 

The smaller the spot, the more bits per inch and greater the storage. Tracks are further divided into sectors, which hold a block of data that is read or written at one time; for example, READ SECTOR 782, WRITE SECTOR 5448.

 In order to update the disk, one or more sectors are read into the computer, changed and written back to disk. The operating system figures out how to fit data into these fixed spaces.

Storage Devices

Dear Members,

           ''Output Devices session is now completed on IT School''

So, now the Session of Storage Devices will be start soon. 

• Storage Devices :-

A storage device is s hardware capable of storing information. There are two storage devices used in computer a primary storage device such as computer RAM and a secondary storage device such as a computer hard disk drive.

 

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