If there is a data loss, then it is advisable to send the hard drive with a reputable data recovery company. If you are experiencing a difficulty with a damaged drive, the best thing to do is to leave it alone and send it on the recovery service provider. People are known to install recovery utilities for the damaged hard drive but simply to worsen the damage.
If you are keen on trying to extract the data on your own, then first attach the damaged drive to another computer and use a secondary slave disk before trying to retrieve the data. Before sending the damaged harddrive for data recovery services, the reputation of the company should be looked at. There is a company known by name Data Retrieval which offers proper data recovery services. You can see this site to know more about raid data recovery services.
It can also be advisable that you obtain an estimate of the charge and time within which the recovery process would be achieved. Usually, it takes 3-5 days for the process to be completed. Depending on the complexity in the problem the cost can be between $300 and $2500.
Whether you want to use technicians, professionals, inexperienced, or some data restoration techniques and tools that can be easily found in internet, you have to make sure that your choice is right. The last thing you want is that your sensitive information will be leaked out so it will be very important to discover trusted company.