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The most common physical failure of modern hard drives is a failure of the magnetic heads.the reason may be the disk drop, hit on him, shaking with the power surge.sometimes the fault of the magnetic heads can be the result of improper interference in the disk device. for example, non-professional recovery attempts with less serious problems. the precursor of the fault may be a breakdown of the controller, and the broken head sector or sticking. to avoid such problems in the future, it is recommended to make backup copies. this means periodically create a copy of important files to allow a return to it in the event of a sudden loss of information. in the case of the files on the disk, backups can be done on a variety of media, such as floppy disks, tape drives, zip-diskette, cd-r, cd-rw, hard disk drives. and this should be done as soon as you notice any signs of insecure work drive. if the hard drive is broken and does not boot the windows does not have time to do a backup, do not rush to pull the hard drive out of the case and beat them on the wall. perhaps spoiled any system file, which does not allow the system to boot. remove your drive and take it to a friend, companion or employee who has a free space on the hard drive, to copy the desired information.but, perhaps, going to your drive, you do not see anything, even though the disc and is not empty.if a defective block of magnetic heads, the data recovery needs to be replaced with a faultless, taken from exactly the same "donor" of the disc.all work must be carried out in special conditions - in a laminar flow hood, which guarantees at the opening of the pressurized zone protection from dust, using devices for the removal of heads. i advise you to entrust this work to professionals.