There are two main hard drive data recovery classifications. Most common is software data recovery. This option is used when you have file system or logical data loss, and is the simplest and cheap option. As a rule, you can perform this kind of recovery by yourself, without having to ship your hard drive. The second is physical hard drive data recovery, and is more knotty, and can be fairly costly.
This option is used if there is physical damage to your hard drive. Symptoms of physical damage are fairly obvious to the user. You may hear a clicking or buzzing noise from your hard drive, your BIOS may not recognize your hard disk, or your computer may not boot up at all. Only an experienced professional will be able to repair your problem when these symptoms are present, as do-it-yourself techniques are simply not available for today's sensitive hard disk drives.
Now for recovering hard disk some tools are used as:-
