The computers have become an essential part of our life, but most of us probably have encountered the situation of unintentionally deleting important data files from computer hard drive. Some users might have also experienced losing whole hard drive data.
The data loss without any backup can become the most severe situation for professionals when their ongoing projects come to a standstill. But the hard drive data recovery is here to help so that we can retrieve missing critical data from failed hard drives.
The hard drive data recovery is done to rescue the files after a logical or physical crash. These files are saved on the hard drive in a pre set manner so an expert can figure out the level of the crash and retrieve or extract the files as per the case.
However, hard drive data recovery isn’t limited only to salvaging the hard drive, but it also covers retrieval of missing files, making the logically damaged hard drive usable and recovering data from formatted hard drives possible.
Now, the hard drive recovery is made possible by using data recovery principles, which simply means that the data still exists on the hard drive, even after deletion, and it can be recovered.
When we delete some files in an operating system the actual file still resides on the file system though the file path gets removed. The data recovery can be performed by using two methods:
Data Recovery Software
Data Recovery Service
Hard drive recovery software simply work by scanning the hard drive and locating the file traces. After finding a file on hard drive, it searches for related memory location in the file system table. If the entry matches, it recovers that file.
Data recovery software are very easy to use and thus does not demand any sound and prior technical knowledge from users’ side. Data recovery software vary from operating system to operating system. In the same manner, they are based upon file system to file system especially for Windows.
On the other hand, data recovery service is totally different from data recovery software. It is essential in physical data loss situations and it works by repairing the damaged hard drive and then restoring data from it.
It is special assistance offered by data recovery companies. The data recovery service is performed in safe surroundings of Clean Rooms by experts. It should not be performed by an end user as it demands specific infrastructure.
An efficient hard drive data recovery plan needs powerful data recovery solution. It may be either data recovery software or data recovery service. Before finalizing any data recovery solution, a user should always evaluate the cause of that crash. Also, the physical condition of the drive can be assessed by a variety of steps. In this way we can conclude that whether the crash requires data recovery software or hands on data recovery servce.
Stellar Information Systems Limited is the most trustworthy provider of data recovery solutions. Stellar’s best quality data recovery software are developed according to the highest standards of data recovery industry. These software are available for almost all computer operating systems.
The data recovery service of Stellar is delivered through State Of The Art Class 100 Clean Rooms by highly qualified and trained data recovery experts. These experts are equipped with sound component level skills and hardware to ensure complete data recovery from hard drives in any logical and almost every physical failure case.
Article Source: http://www.articlealley.com/http://bradjerry.articlealley.com/hard-drive-data-recovery-771052.html
Fix Damaged Images AFTER Data Recovery Has Been Performed?
I used a data recovery program to recover lost images from my digital camera. Unfortunately some of them came out grey. Meaning, when I look at the picture as a thumbnail, I can see the entire picture, but when I open the image, a large portion of it completely greyed out. Any idea of how I can fix these images? I’ve tried recovering them twice and both times the same images came out damaged.
Answer
The photos are damaged. The embedded thumbnails appear fine because they were pre-generated. Think about it like a lock and key: if one tooth of a key is missing, it’ll still fit but it won’t unlock the door. Recovery may be possible but only if you know what you’re doing.
Here’s how one person capable of preforming these recoveries describes the condition:
” – Grey Areas in your Image
In various forums on the internet, people have incorrectly stated that photos are unrecoverable if they contain gray areas. This is not usually true. Some JPEG decoders are very picky with how they recover from errors and simply report Drawing Failed (in Windows Picture and Fax Viewer), while others might draw a middle-gray region or just display a “Red X”. In some cases the gray area is in fact completely damaged (overwritten by unrelated data), but this is not always the case.
– Why do JPEGs get damaged?
There are many sources of damage to photo files, but the most common reasons are:
– Photos were deleted or formatted & a “recovery” utility was used
– Memory card / hard drive error (logical or physical error)
– RAM failure
– File transfer / interface error (memory coherency issues, buffer over/underrun, etc.)
– What Happens when you Open / Decode a Corrupted JPEG?
Even a single byte changed in a JPEG file can cause an image to be unrecognizable (or not open at all). Why? Because of the way JPEG compression is designed, images are stored in tightly-packed streams of binary bits (not bytes). Each pixel can be represented by as few as 2 bits to as many as 26 bits (dictated by the variable-length Huffman Coding scheme). To make matters worse, in an effort to keep the compression as efficient as possible, there is virtually nothing to indicate where you are in the stream of bits (unless Restart Markers are used). Therefore, as soon as a single bit is encountered wrong, the millions of bits that follow will be decoded incorrectly as well. The manner in which DC and AC coefficients are arranged in MCUs means that this corruption often shows up in shearing, wild color shifts and many other visual phenomena.”
– http://www.impulseadventure.com/photo/fix-corrupt-jpeg-photo.html
It appears from the examples and comments that he or she is fully capable of preforming JPEG recovery when such operation is possible. Unfortunately, the author no longer accepts recovery requests.
There are similar JPEG recovery services available but your photos should be worth the cost. Here’s one example (I don’t know the reputation of the company so I can’t recommend it):
http://www.jpeg-repair.org/
The company above seems to recover a small number of JPEG submissions for free for their own analysis and your benefit.
There are a number of recovery tools available too, but unless those pictures are very important they aren’t worth the money; you don’t know for sure if the files are recoverable, but mostly because you’ll only have the programmers word that it even works.
http://www.google.com/search?client=opera&rls=en&q=jpeg+recovery&sourceid=opera&ie=utf-8&oe=utf-8
