So I got this problem since today. My Second Drive, which is the one without the OS installed, is constantly at 100% active time while having 0 KB/s and 0KB/s. Sometimes my PC and BIOS don't even see the drive. I had the problem that my PC nor BIOS don't see the drive before, but never the 100% active time. When I try to go into the drive, via clicking on it in "This PC" my PC completely blocks. Booting software from the Drive is a no go, it either blocks or doesn't boot at all. The drive is a 1TB, 7200RPM drive. The first drive, with the OS on, is a Samsung 840 pro 256GB SSD. When disconnecting the HDD, and only using the SSD, all works fine. But that isn't rly an option as I have important files, programes and games on that drive.