One of the most common cause of data lose in hard disks is due to human errors where a person deletes a file or installs a new operating system having not backed up his/ her data recovery. When this happens, you might be required to download software from the internet which will help you recover your lost data from the disk. However be ready to spend some money as most free software are no good. This loss of data however does not mean that your hard disk is faulty.
If you however drop the hard disk or smash it, then you will have to contact a specialist who will open up the hard disk, replaced the damaged components and perform data recovery for you. There plenty of companies nowadays that perform this service. These data recovery companies are such as: LVC Data recovery in Africa, KrollOntrack in the UK and Drive Savers in North and South America.There are other problems that may cause you to lose data in your hard disk. If you are not an IT guru be sure to contact a data recovery specialist for best results.