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

Entrepreneurship, explain succession planning and strategies for harvesting...

explain succession planning and strategies for harvesting and ending the venture

System for an online furniture shop, As an XML expert you are needed to mod...

As an XML expert you are needed to model a system for an online furniture shop. After an interview with the shop manager you have the certain information: The detail of th

Write a program for comparing two strings, Q. Write a program for comparing...

Q. Write a program for comparing two strings? Let's write a program for comparing two strings. Determine the following piece of code that has been written in C to compare two s

What is the purpose of the enableevents() method, The enableEvents() method...

The enableEvents() method is used to enable an event for a certain object. Normally, an event is enabled when a listener is added to an object for a certain event. The enableEvents

What is orbix?, Orbix is a CORBA ORB (Object Resource Broker) - a commercia...

Orbix is a CORBA ORB (Object Resource Broker) - a commercial software product which helps programmers builds distributed applications. Orbix is an execution of the OMG's (Object Ma

Data type, Define data type and abstract data type comment upon the signifi...

Define data type and abstract data type comment upon the significant of both

Determine the bios function with one illustration, Determine the BIOS funct...

Determine the BIOS function with one illustration BIOS stands for Basic Input Output System. It is a set of programs to provide most basic low-level services like services keyb

What do you meant by dreamweaver, A Web site is a set of linked documents w...

A Web site is a set of linked documents with shared attributes, like related topics, a similar design or a shared purpose. Macromedia Dreamweaver is a site creation and management

What is the necessity of an interface, What is the necessity of an interfac...

What is the necessity of an interface?  Any device that has to be linked to a CPU requires an interface. This takes care of the mismatch in speed, data and electrical character

Computer grphics, Advantages of DDa algorithms for line drawimg

Advantages of DDa algorithms for line drawimg

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