First of all, of course, I checked the disk for the integrity of all sectors, reassured myself, so to speak. Then he simply began to transfer all the contents of the hard drive from the PC to an external drive. Immediately noted the copying speed from 40 mb / s to 90 mb / s. The differences depend on the data itself, its size and how it is stored: archives, folders, etc. In short, the performance suited me. I do not often use the disk, but it does not lie idle, I'm still sure of it.See full review