How to access the disk data, Computer Engineering

Assignment Help:

Q. How to Access the Disk Data?

Disks operate is semi-random mode of operation and generally referenced block wise. The data access time on a disk comprises two major components:

  • Seek time: Time to position head on a particular track. On a fixed head disks it's time taken by electronic circuit to select needed head whereas in movable head disks it's time needed to move head to a specific track.
  • Latency time: This is time needed by a sector to reach below read/write head. On an average it's half of time taken for a rotation by disk.

In addition to seek and latency time the time taken to transfer a (read/write) block of words can be considered however normally it is too small in comparison to seek time and latency and in general disk access time is concerned to be sum of seek time and latency time. Because access time of disks is large so it is advisable to read a sizeable part of data in a single go and so disks are referenced block wise. As a matter of fact you will find that in most of computer system input/output involving disk is given a very high priority. Fundamental reason for such priority is latency time which is needed once the block which is to be read passes below read-write head. It may take time of order of milliseconds to do it again, in turn delaying Input /Output and lowering performance of system.


Related Discussions:- How to access the disk data

What are the disadvantages of linux, What are the disadvantages of Linux? ...

What are the disadvantages of Linux? Learning Lack of comparable programs More technical skill required

Define the term ''turn-around'', The "turn-around" time of a user job is th...

The "turn-around" time of a user job is the? Ans. Total time taken to execute the job is called "turn around" time.

Explain working of jaz drive, Q. Explain working of Jaz Drive? Jaz Dri...

Q. Explain working of Jaz Drive? Jaz Drive: Jaz drive is a well-liked drive with 2GB and unleashes creativity of professionals in graphic design and software development, pub

What is computer virus, What is computer virus?  A  computer  virus  is...

What is computer virus?  A  computer  virus  is  a  computer  program  that  is  designed  to  spread  itself between   computers.   Computer virus are inactive when standing a

Risks by financial service provider perspective, What are the risks by fina...

What are the risks by financial service provider's perspective in Electronic Payment Systems? Through the financial service provider's perspective: • Stolen service or c

Concept of mouse, The concept of Mouse was designed by Douglas C. Engelbart...

The concept of Mouse was designed by Douglas C. Engelbart of Stanford Research institute and first Mouse was designed by Xerox corporation.  Mouse itself is a device that gives you

How different are interface and abstract class in .net, How different are i...

How different are interface and abstract class in .Net? Abstract classes cannot be instantiated it can have or can't have abstract method basically known as must inherit as th

What is cts and cls, What is CTS and CLS? CLS stands for common langua...

What is CTS and CLS? CLS stands for common language specification CTS stands for common type system.

Show arithmetic subtraction, Q. Show Arithmetic Subtraction? The subtra...

Q. Show Arithmetic Subtraction? The subtraction can be done easily using 2's complement by taking 2's complement of value which is to be subtracted (inclusive of sign bit) and

Oo modelling, We might model such a scenario using three types of object: o...

We might model such a scenario using three types of object: one for Customers, one for BankAccounts and another for Transactions. In terms of data required, for Customers assume we

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