External HDD suddenly got much slower

marcel.peharda

Prominent
Nov 8, 2017
9
0
510
I have a 500GB WD HDD in a USB 3.0 enclosure case. Usually the speed was nothing mind-blowing - 40MB/s, which is pretty low for 3.0, but I didn't really bother, I was satisfied.

Yesterday I tried moving some files from the drive directly to a USB. The operation failed (and I didn't do anything, it failed out of nowhere), and it got really really slow afterwards. Usually the speed now is around 2-3 MB/s, and connecting and disconnecting the HDD takes a good 30 seconds. I tried various possible solutions - Windows' error repairing tool, chkdsk, I think EaseUS' "Check partition" function. All show that my hard drive is fine, that there are no errors whatsoever. I'm confused and I don't know what to do. I don't want to format it, there is quite a lot of stuff on it and I don't have enough space on my PC to back it all up.

Would anyone be kind enough to forward me to another possible solution?

Thanks in advance.

Edit: Tried a different, 2.0 enclosure case. It's slightly faster (around 6 MB/s), but extremely inconsistent. Also, I tested the 3.0 case with another hard drive and it worked great. So, the enclosure case is not the issue.

Edit 2: I backed up my most important stuff and went on to format it. Unfortunately, it's still really slow, slower than before, actually. What's the deal?
 

marcel.peharda

Prominent
Nov 8, 2017
9
0
510
I'm currently trying the WD diagnostic software, will see what'll be of it. It's going painfully slow.

It's around 6 years old, but I'm the second owner, had it for like 2 years now.

I think I defragged it like half a year ago, I'll give it one more go.