Can someone tell me how a data recovery software actually works?

Q. I've a presentation tomorrow in which I have to tell how a data recovery software works in a nutshell. How it traverses through HD, how it judges whether the data is a complete file or Allocation Table....? How it tells what's the file extension? etc
Plz tell if you have relevant information... best answer gets 10 points!

A. My friend its a very big process to explain how recovery data software works.But one thing i know that when data is lost it can be recovered by data recovery services. One of my friend use the data recovery service to recovery his lost data fro http://www.recovermypc.com/

I Need to find a very good software for data recovery from my Hard Disk?
Q. Also, are there any very free data recovery softwares around?

A. For Data Recovery Software visit at:

http://www.nucleustechnologies.com

I think you can find different types data recovery software at this site.
you can download free demo of data recovery software

What are the chances of data recovery from a compact flash drive?
Q. I have a non-responding CF with some important academic docs and pictures. Local IT guys and one data recovery firm were helpless while another firm claims to be able to recover for $900. I am wondering if I should take the chances. Of course I know it depends if I value my data as much as to pay $900. While I can not price the data, the cost does seem to be pretty high....

A. Your chances depend on why your CF has failed, data may be recovered by completely dismantling the card and read data directly from the memory IC's, in which case $900 is about right, but even then it's not guaranteed




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