I have been using the WD Caviar Green 1TB HDD as my OS drive for nearly 4 years now. I installed a 2TB Blue HDD (which is essentially a rebranded green drive). My OS HDD now has a problem of not getting detected 50% of the times. I tried changing the SATA port, Cables and all other stuff. But it's a hit or miss most of the times. It happened again like 2 hours back so I repeated the process and it's working now. But I have noticed that my mouse and keyboard are freezing every couple of seconds. The RAM and CPU usage are the same as before. Could it be an indication of HDD failure? Should I back up all my important data on the new HDD? P.S. This all started happening after I installed the new HDD and updated bios. CrystalDiskInfo says that both of my HDDs are in good health. Before the bios update, I used to have a problem of boot loop. I have Gigabyte GA B75M D3H.