What are the physical characteristics of magnetic disks, Database Management System

Assignment Help:

What are the physical characteristics of magnetic disks?  

Ans: A magnetic disk is a circular plate or platter of plastic or metal that is coated with magnetizable material like iron-oxide on both sides. Data are recorded on the disk surface in the type of tiny invisible magnetized spots (denoting 1s) or non-magnetized spots (denoting 0s). A conducting coil, named as Head, carries out the job of reading and writing on the surface of magnetic disk. Usually, the head remains stationary whereas the disk rotates below it for reading or writing operation. The surface of the disk is categorized into a number of concentric circles known as tracks. Number of tracks alters from disk to disk. Each track is further sub categorized into sectors. Every sector of a disk is assigned a unique number. Each sector having similar capacity.

1315_What are the physical characteristics of magnetic disks.png


Related Discussions:- What are the physical characteristics of magnetic disks

Describe embedded query language, Describe Embedded Query Language? Emb...

Describe Embedded Query Language? Embedded Query Language - A query language (e.g., SQL) can be implemented in two ways. It can be used interactively or embedded within a host

A step-wise distributed database design methodology, A step-wise distribute...

A step-wise distributed database design methodology Following is a step-wise methodology for distributed database design. (1) Examine the nature of distribution. Find out wh

Explain how you can define an object model of a system, Explain how you can...

Explain how you can define an object model of a system. A list of terms that shall be used by end users to describe state and behaviour of objects in system.   Different use

What is a query tree, What is a query tree?     Ans:  A query tree, as ...

What is a query tree?     Ans:  A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu

Define access time, Define access time. Access time is the time from wh...

Define access time. Access time is the time from when a read or write request is issued to when data transfer starts.

Entity relationship diagram, Ask questApollo Hospitals (AH) is a popular me...

Ask questApollo Hospitals (AH) is a popular medical service provider in Oman. AH wants to automate its business functions into an information system. The proposed information syst

MYSQL, write an SQL statement to create the database in MYSQL server

write an SQL statement to create the database in MYSQL server

Develop and evaluate partial systems, Part 1: Security Plan Consider th...

Part 1: Security Plan Consider the Case study and identify 3 security requirements. For each of these security requirements: • Discuss the necessity for the feature and how

Mixed fragmentation, Mixed fragmentation: Sometimes, horizontal fragmentati...

Mixed fragmentation: Sometimes, horizontal fragmentation or vertical fragmentation of a database schema by itself is insufficient to sufficiently distribute the data for some appli

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd