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What is magnetic disks?explain it?
Magnetic disk provides the bulk of secondary storage of modern computer system. The disk capacity is growing at over 50% per year. But the storage needs of large applications have also been growing very fast and in some case each faster than the growth rate of disk capacities. A large data base may need 100 of disks.
Physical characteristics of disk
Physical disks are relatively simple. Every disc platter has a flat circular shape
We can call magnetic disk as
Ø hard disk
Ø Floppy disk
The read write head keeps information on a sector magnetically as reversals of the direction of magnetization of the magnetic material. There might be hundreds of concentric tracks on a disc surface, having thousands of sectors.
What was the method in which records are physically stored in a specified order according to a key field in each record ? A method in which records are physically stored within
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The users who use easy-to-use menu are called ? The users who use easy to use menu are called as Naïve users.
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
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Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
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Explain the Management of Data Store Every system irrespective of its nature of application requires storing permanent data for consequent use in problem solving. Some objects
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