When you are using a data recovery program to recover your files you need to make sure that the files recovered are not corrupted. Some data recovery programs will tell you that the data is not corrupted before recovery but the best way to check for data corruption is to

1. If its a document then open the document and see if all your data is there. If the document is corrupted then the document will not open or the document will open but some of your data will be missing.

2. If its a program then see if the program will start. If the program is corrupted then it will not start or run properly.

3. If its a picture then open the picture in a program and see if the picture opens.

Even if the data recovery program your using to recover your files tells you that the data that you want to recover is not corrupted before you try and recover it you still need to check the recovered data for corruption after recovery. The data could be corrupted even if the data recovery program tells you your data is not corrupted.

One reason your recovered data might be corrupted is that some data recovery programs use the boot sector, partition table and Fat(File allocation table) on the disk to recover your files. If the boot sector, partition table, or Fat (File allocation table) information on the disk is corrupted then the recovered data will be corrupted.

This is one reason that using a data recovery program that does not need to look at the boot sector, partition table or Fat (File allocation table) on the disk could recover your data in the case where the boot sector, partition or Fat (File allocation table) on the disk is corrupted.

Read more information on The PC Guide about the Fat(File allocation table)

Read more information on Wikipedia  about the Fat(File allocation table)

We have mentioned the Fat (File allocation table) in this post. There is another file system called NTFS (New Technology File system)

Read information on the PC Guide about the NTFS(New Technology File System)

Read information on Wikipedia about the NTFS(New Technology File System)

For more NTFS(New Technology File System) information we suggest you visit http://www.ntfs.com/

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