Unfortunately we are never asked this question. The hard disk only externally resembles the record player where the songs can be played successively. Within every hard disk there is an individual logic depending on the specific model. The hard disk is administered by an internal Microprogramme. Though an opened hard disk looks simple and easy, however, the parts are adjusted extremely exactly to each other. The parts are electrostatically very sensitive. In order to repair something inside a hard disk, besides special tools, at least experience is esssential. Some models have their heads adjusted to the lid. After opening the hard disk, the original position gets lost. Open and manipulated hard disks mostly complicate the diagnostics and the following data recovery process very strongly.