You may delete a file you needed. Or lost a file in the system somewhere. We can scan your hard drive and find lost files even after a hard drive has been formatted, we can possibly recover your data. If the hard drive fails for some reason, we may still be able to recover the data from it. VERY IMPORTANT: If you realize a file is missing, STOP using your computer. Shut it down immediately and get it to us as soon as you can. Continued use of the computer will cause data files to be over-written and then impossible to recover. We realize the importance of user data files and give our absolute best effort in the recovery process. We do not guarantee the data is recovered. Many factors may deteriorate the integrity of the hard drive and/or the data.