The first recommendation in this regard is to know that go with companies specializing in drive repair hard is the option that will probably bring you better results, since they have experience in the field of recovery of files, as well as tools and facilities necessary to perform the procedure. Most disk recovery companies, obtain very good results in terms of information backup damaged, only in situations such as catastrophic accidents such as a fire where the dishes with the magnetic material, a provider of data recovery have cast will not be able to recover data from damaged hard disk. It is important that you quote with several companies in this giro, today you can make a quote via the internet, and there are some hard drive repair companies that would be awarded a diagnosis without cost. One of the first steps that will define the company to retrieve data from your hard disk, is if This presents order electronic or mechanical problems. How can you identify this? On the one hand, you should know that hard drives have two modules, one is the electronic module, which contains all the circuitry of control of the disk and the other, mechanical module that is enclosed in a metal casing and contains dishes with magnetic material and heads reading and writing of the hard disk. Thus, through these modules, experts in recover deleted or damaged files will determine the source of the fault. One of the first recommendations in this topic is to check if the hard disk starts while turns on the computer, and it is important to take into account the sounds emitted. A damaged hard disk can be identified by the type of sound that generates, is similar to a click. According to the experience and knowledge of the companies that offer advice to retrieve data, usually a hard disk damaged by electronic issues can be If the hard disk turn normally, without noise, but is not recognized by the computer. In case of a hard disk damaged by mechanical complications, likely that the hard disk, as already mentioned, emits strange sounds like a click. Remember that you will also depend on the brand of the disc. It is best to go with a company that has a specialized laboratory and has the necessary tools for the repair of hard disk..