As and when you get to know about the data loss the first thing that you should do is just don’t panic. Next you should remove the hard drive from the computer, pack it in some anti static packaging and keep it in some safe place. After that, call a data recovery professional and hand over the hard disk to them. They will start the analysis of the hard disk in their lab. Till here if everything goes right then your 100% data can be recovered. But if you had altered some files i.e. add new file or append an existing file then the chances are that the deleted file may have been over written by the new file. In this case the chances for 100% data recovery are very less.

Another thing you must keep in mind that you should not employee an unqualified person on this job. Seek the assistance of experts in this field. A new person can create more of data loss than he could save. Because sometimes the fault is in physical component of the hard disk that can only be repaired in special labs that are 100% dust free. Even a single dust particle can cause severe damage to the hard disk. The data recovery professional after checking hard disk for physical faults seek help of special file recovery software to recover deleted files. The file recovery process takes some time as the lost chains of the files are searched in the spool of free memory.