Components of magnetic disk, Computer Engineering

Assignment Help:

Q. Components of magnetic disk?

Disk itself is mounted in a disk drive that comprises arm which is a shaft that rotates disk and the electronics required for input and output binary data. A non-removable disk is permanently mounted in disk drive. Hard disk in a personal computer is a non-removable disk. A removable disk can be replaced or removed with any other disk. Benefit of latter type is that unlimited amounts of data are available with a limited number of disk systems. In addition ZIP cartridge disks are illustrations of removable disks. Figure below illustrates other components of disks.

422_Components of magnetic disk.png

Figure: The Disk Components

Head mechanism provides a classification of disks in three types. Usually read-write head has been positioned at a fixed distance above platter allowing an air gap. At the other extreme is one head mechanism which in fact comes in physical contact with medium at the time of a read or write operation. This mechanism is used with floppy disk that is a small, flexible platter and the least costly type of disk.

To understand third type of disk we have to comment on relationship between distance of head from surface and data density. Head generates or senses an electromagnetic field of sufficient magnitude to read and write correctly.  The narrower head is the closer it should be to platter surface to function. A narrower head signifies narrower tracks and so greater data density that is desirable. But closer the head is to disk, greater are the risks of errors from imperfections or impurities.

To push technology advance Winchester disk was developed.  Winchester heads are employed in sealed drive assemblies which are nearly free of contaminants. They are designed to operate closer to disk's surface than conventional rigid disk heads so allowing greater data density. Head is in fact an aerodynamic foil which rest slightly on platter's surface when disk is motionless. Air pressure produced by a spinning disk is sufficient to make foil rise above surface. Resulting non-contact system can be engineered to use narrower heads which operate closer to platter's surface than conventional rigid disk heads.


Related Discussions:- Components of magnetic disk

Find the average of two values, Q. Find the average of two values? Find...

Q. Find the average of two values? Find the average of two values which are stored in  ; Memory locations named FIRST and SECOND  ; And puts result in memory location AVG

Show basic concepts of permutation, Q. Show Basic concepts of permutation? ...

Q. Show Basic concepts of permutation? Let us look at the basic concepts of permutation with respect to interconnection network.  Let us say the network has set of n input node

Determine 8-input multiplexer IC in the TTL family, The commercially availa...

The commercially available 8-input multiplexer integrated circuit in the TTL family is ? Ans. In TTL, MUX integrated circuit is 74153.

Illustrate internal organisation of ram, Q. Illustrate Internal Organisatio...

Q. Illustrate Internal Organisation of RAM? The construction displayed in Figure below is made up of one JK flip-flop and 3 AND gates. The two inputs to system are one input bi

Calculate quantities from information in bayesian network, 1. A Bayesian ne...

1. A Bayesian network is shown for the variables paper Thickness, paper Alignment and Print Quality. The conditional probabilities are provided in the tables beside the nodes. Here

What is a spanning tree, What is a spanning Tree? A spanning tree is a ...

What is a spanning Tree? A spanning tree is a tree associated with a network. All the nodes of the graph appear on the tree once. A minimum spanning tree is a spanning tree

Two ways of converting a two input nand gate to an inverter, 1)      Short ...

1)      Short both I/Ps of NAND gate & use the gate as an inverter. 2)      Connect any one of the two I/Ps to VCC & use the remaining I/P & use the gate as an inverter.

C++, find the minimum total number of shelves including the loading process...

find the minimum total number of shelves including the loading process

What is object orientation, What is object orientation? Object orientat...

What is object orientation? Object orientation means that we classify software as a collection of discrete objects that incorporate with together DS and behaviour. Four aspe

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