Agree that Chinese products are cheap and affordable, but we cant say about the durability of their products, initially it seems you have got the best of the price. but later you find out that it is worth the money you have spend on it.
Here is the same story about Cheap Chinese 500GB Hard Disk which a man took to get it repaired when he observed that his files are not working.
Here is fake Hard Drive Size.
Looking at the photo above, it seems you have got an authentic Hard Drive. But when you look inside the case, you will find a 128MB Flash Drive which is working in a loop mode, which means, that whenever the flash drive runs out of memory, the files start overwriting from the beginning.
Though it is tough to understand how this thing actually works, I have experienced something similar to it few years ago with a 8GB Flash Drive which I bought at a price of dirt.
TechTip Advice: Memory is an important part of a Computer which stores important data. Always buy genuine memory to secure your data.
(read the original story but it’s in Russian).