Hi there sharifshikder,
After you are getting this message, you should back up your data as soon as possible. After that, you should run a hard drive testing software program and check out its health. It is also a good idea to try the following: Go to the Hard Drive -> Right Click -> Properties -> Tools -> Error-checking ->Check Now-> Click both Options -> Start
If your problem is caused by bad sectors and the upper solution solves your problem, keep in mind that this just a temporary solution. Once bade sectors start to appear,they will eventually continue to do so.
Hope this will help,
D_Know_WD