External USB hard drive clicking. Chkdsk says it's fine

Is it just making that noise when it is accessing a file? It could just be a very loud head movement. Or is it clicking all the time? That would be more worrisome.

chkdsk just tells you if the logical file structure is OK. It doesn't look at the mechanism of the disk.

As long as it's not the only copy of your data, I'd say keep using it if it works.

Not sure, but I just copied a file for fun, and it was clicking pretty loudly. I have another 1 TB Lacie drive and when accessing files it never clicks. You can hardly hear it.

Well, hard drives are mechanical. Loud noises could be an indication of something wrong, but I can't tell from here.

If it's a little irritating but you can live with it, just make sure files are backed up. If it's in warranty, maybe contact the manufacturer and see if they'll swap it out for you.