You can download a tool from Seagate from here. Which will help you to find troubles related to your hard disc.

SeaTools for Windows is a comprehensive, easy-to-use diagnostic tool that helps you quickly determine the condition of the disc drive in your external hard drive, desktop or notebook computer. It includes several tests that will examine the physical media on your Seagate or Maxtor disc drive and any other non-Seagate disc drive.

Some of the tests will take hours, and be careful when u use the advanced tool (the application itself will warn you)