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

Define a macro definition consists of, A macro definition consists of ? ...

A macro definition consists of ? Ans. A macro Definition have: A macro prototype statement, one or various model statements and also Macro pre-processor statements

Handling multiple devices - computer architecture, Handling Multiple Device...

Handling Multiple Devices Interrupt Priority   Continue to accept interrupt requests from higher priority components   Disable interrupts from component at the sa

Re:- exam help, Hello there i have 4 exams of ICT and i am after a tutor wh...

Hello there i have 4 exams of ICT and i am after a tutor who can help me in those 4 subjects. One hour for each subjects will be good for me as i have sample papers ready for all s

Electrical technology, voltage,current and power relation in a delta connec...

voltage,current and power relation in a delta connection

How can server communicate with more than one client, Server can interact w...

Server can interact with more than one client with using threading concepts there are java threads which are allocated to each client when he logs in to server, the thread handles

Draw state diagram, Draw the state diagram of a process from its creation t...

Draw the state diagram of a process from its creation to termination, including all transitions, and briefly elaborate every state and every transition. When a process executes

Super ascii string cost, ascii code add=2unit,replace=1unit,delete=3unit.co...

ascii code add=2unit,replace=1unit,delete=3unit.convert ascii code in minimum cost

Induction that your closed formula , Show by induction that your closed for...

Show by induction that your closed formula from (c) is the number of times that the given statement is implemented for a problem of size n.Note: if your proof is easily  a proof th

Doubly linked list, A doubly linked list is like a linked list except that ...

A doubly linked list is like a linked list except that each node has a pointer both to the next node in the list and to the previous node in the list. There are also pointers to th

Describe target processor arrangements, Q. Describe target processor arrang...

Q. Describe target processor arrangements? Having seen how to describe one or more target processor arrangements we need to initiate mechanisms for distributing data arrays ove

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