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

Determine in brief about laptop computers, Laptop computers Laptop comp...

Laptop computers Laptop computers have the obvious advantage over desk-top computers (PCs) in that they are fully portable. This is of specific value if a user wishes to do wor

Feature Extraction and clustering, Hi, I have a CSV file that has numbers ...

Hi, I have a CSV file that has numbers data set. The data set contains images of handwritten digits. Recognizing handwritten digits is already a mature technology By using R code

What is hamiltonian path, What is Hamiltonian path?  A Hamiltonian path...

What is Hamiltonian path?  A Hamiltonian path in a directed graph G is a directed path that goes through every node exactly once. We consider a special case of this problem whe

Applications of microprogramming - computer architecture, Applications of M...

Applications of Microprogramming: Microprogramming application:: emulation o   Use of a micro program on 1 machine to execute programs initially written to run on ano

Define syntax of mpi_bcast function, Q. Define syntax of MPI_Bcast function...

Q. Define syntax of MPI_Bcast function? MPI_Bcast(msgaddr, count, datatype, rank, comm):   This function is used by a process ranked rank in group comm to transmit messag

Classification of parallel computers , Classification Of Parallel Computer...

Classification Of Parallel Computers  Introduction Parallel computers are those that underline the parallel processing among the operations in some way. In the last unit,

Jewel polishing, Byteland county is very famous for luminous jewels. Lumino...

Byteland county is very famous for luminous jewels. Luminous jewels are used in making beautiful necklaces. A necklace consists of various luminous jewels of particular colour. Nec

Could tcp allow ip to checksum the data, Could TCP allow IP to checksum the...

Could TCP allow IP to checksum the data? TCP cannot permit IP to checksum data yet IP has its own checksum for its header. IP layer is fundamentally responsible for routing of

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