SECONDARY MEMORY:-

SECONDARY MEMORY:-


When You Want To Keep Data OR Information Permanently, You Need To Transfer The Data From Primary Memory To A Magnetic Disk OR Optical Disk. Since Primary Memory Is Made Up Of Silicon Chips That Is Why It Is Expensive Than Secendary Memory And Has Less Capacity Than Secondery Storage. The Device Used To Read Data From The Disks Is Called A Disk Drive. The Main Function Of The Secondery Device And Storage And Retrieval. There Are Three Common Types Of Secondery Storage Device(Floppy Disk, Hard Disk, And CD-ROM).

                                                     MEMORY

There Are Primarily Two Types Of Computer Memory. On Is Main OR Primary OR Internal Memory And The Other Is Secondery OR Auxiliary Memory. Internal Memory Is The Memory Used By The Computer"s Processor To Run Is Application"s, Program And Operating Systems. This Internal Memory Is Often Reffered To As RAM, Which Stands For Random Access Memory.

The Other From Of Memory Is The Auxiliary Memory Which Is Where The Computer Will Store Information That Is User Genereted. Exampales Of Auxiliary Memory Are You Hand Disk, Your CD-ROM"s And Your DVD.

01. HARD DISKS 

                                                       

      

Hard Disk Is A Magnatic Disk On Which You Can Store Computer Data. Hard Disk Hold More Data And Are Fater Than Floppy Disk. Now-a-Days, Hard Disk With Capacity Of 320 GB Storage And 500 GB Are Very Common.

                                            

A Hard Disk Usually Consists Of Several Hard Platters. Each Platter Requires Two Read/Write Head, One For Each Size. ALL The Read/Write heads Are Attached To A Signal Access Arm So That The Cannot Move Independently. Each Platter Has The Same Number Of Tracks, And The Track Locations That Cuts Across All Platters Is Called A Cylinder.

In General, Hard Disk Are Less Portable Than Floppies, Although Removable Hard Disks Are Also Available In The Market.