One of the findings to such type of recovery of data from hard drive is that, hard drive usually never erases the partition or data. If you erase the files from the operating system, the files will be just tagged as 'been deleted' and whatever you save more and more files to them, i.e. to the hard drive, the system will label such files as having been deleted and consider it as void space and willingly copy over them. But still there are disaster file procedures to recover the hard drive which is almost same as that of file recovery hard drive process utilizes from repaired hard drives in a condition which affects to a lesser extent. According to the file recovery specialists the measure of data can be in large volumes. If there is no back up taken, then only a professional can help you recover the data from the hard drive In an urgent case, if you forgot to get the back up for your data, you really require an expert to the do the recovery for you and you have several, options for that, as there are number of laptop experts available nowadays who can assist to recover the files and data and also modify the damages caused to the hard drive. Is you doubt so, shut down the computer immediately .If the problem is physical or external, don't execute over the drive as it may damage the head component or stack of the hard drive which will cause more complications Recovery after corruption Whenever you have reformatted the hard drive accidentally don't try to write anything new into the hard drive, because the files that you have erased are still inherent within the computer somewhere. They are back up with FAT file system16,32, as well as VFAT which can be used with any operating system of Windows like NT, XP, 95, 98, ME, 2000, 7. But it has to be noted that only a free demo trial is there in the online ,but still it quite satisfies the needs of recovery or will give you a better idea of the recovery process, so that you can buy if you would like to. Some of the organizations nowadays charge fees for the external hard drive evaluation. But still there are free services given by some providers which need to be checked. After the evaluation or measurement carried out for the external hard drive recovery, an estimation of the whole process will be given by the technician.