I bought a hard drive, which is second hand and thought it might be counterfeit just from the way the plastic looked on the outside of it. I tried to do some research, but when I found a photo of the same drive for sale brand new, it also looked terrible. See the photo here - and this is from a reputable website. My drive looks the same as this.
The hard drive is a WD Blue 3.5" ATA WD3200AAJB. Compared to other old hard drives I have which are lying around (Maxtor, and Seagate) this one feels a lot lighter, but then those other hard drives are about 6 or 8 years old. I have checked some of the codes on the hard drive to see if they correspond to similar codes on the underside of the hard drive, but in truth I don’t know exactly how to tell a fake from a legit one.
I am amazed at how badly they seem to be put together. I mean the plastic doesn’t bother me if the drive works OK, but it looks like something you might buy from China.