Hi there Kabelis,
I would advise to wait for a while as well. If the issue persists, I guess you need to cancel it at one point. After that, the first thing you need to do is to just back up the most important data stored on the drive.
After that, you need to test the drive with some HDD testing tool: http://www.tomshardware.co.uk/forum/282651-32-best-diagnostic-testing-utility