Well, here's the story:
I have 2TB WD Essential. I copied some large files into another HDD. In the outgoing process, accidentally, I shut down the entire electricity in my home network. I found some files (2 .mkv files actually) didn't running properly, as the result.
So I'm running a HDD repair disk using Windows. And it took soooo long! Over 24 hours! And unluckily, again, the process stopped because of blackout.
I wonder if there are any faster way to scan and repair disk, especially the large size of disk.