There should be four semicircles, and there is only one trademark. What's more, the semicircle is not on a horizontal plane, and it is a fake. Nowadays, it is very common to copy and steal anti-counterfeiting codes and serial numbers. There are several possibilities in your situation: 1. Refurbished or parallel hard disks, using counterfeit packaging boxes; 2. Forge products, steal and copy serial numbers and others.