Loss of data can be very frustrating! It doesn't matter if they are for your business, work or private use. Have you experienced losing photos or videos of an important event such as a wedding, birthday, anniversary or just any other very important day in your life? Or how about losing files that you have been working on for several days, weeks, months or even years!
Many people have experienced it before when storage device suddenly stops being recognized by your system. This can be caused by many factors from a file system corruption to mechanical/physical damage. You could try restarting your system a hundred times and it still won't detect it. It takes an expert in the field of data recovery with a lot of experience to recover those files. If you have a backup of your files then you can just copy them to a new drive. But if you don't have a backup, then you have to find a reputable company that specializes in data recovery.