We have seen many problem with our hard disk. lets take few such conditions.

1) Accidently you format any drive, and lost your data.

 

2) Drive has suddenly changed raw and you are unable to access the drive. When you check with any partition utlity , you find it empty.

3) Hard disk crash, and all data is lost.

 

4) When you double click any drive, it give you erroe as "Do you want to format it now"

Ok here is one very good and free software to recover your data.  GetDataBack

 

Download from here: