Hi there DG41WV,
If a given HDD makes clicking, cracking, grinding and such types of weird noises, this most of the times is an indication of something being wrong with it. I would suggest you to back up your data as soon as possible. Another thing you can do is to run a brand specific testing software and check the health of the drive. If it fails, I guess you should just get a replacement.
Cheers,
D_Know_WD