I have an Asus z87 Pro MOBO that has all 6 Intel Sata Ports being used. The board has 8 total ports, 6 Intel (yellow) and 2 Asmedia (brown). One is an SSD and the other are all HDDs. Everything was stable for years and the machine boots in around 5 seconds. I began to run low on space so I picked up a WD 8TB Red and added it to one of the Asmedia ports. I boot the machine and noticed it took about a minute to boot, which is markedly longer than the normal 5 seconds. When it finally boots, things are a bit laggy, like opening windows explorer takes a bit to load all the hard drives and even longer to click into each one. I see the new WD drive and I initialize / format it to NTFS, and name it. I run a short test which it passes, and then begin an extended test. While doing that I was transferring stuff around the other hard drives and the speed simply dropped to around 3 Megs / sec. The system then got really slow so I rebooted. This time it took 5 minutes to come back up. When it did, two of the drives are not present, though the new WD is. Disk Mgmt took like 3-5 minutes to load and showed two drives as not initialized / formatted. I launched my Disk checking software and one of them that was missing, popped back up in tact, but is painfully slow to respond. I rebooted a few times each time seeming to take longer than the last. The one drive never came back, even after disconnecting the new WD drive and the system is almost unusable. I don't know what happened, and with the change (new HD) disconnected, the problem is still present. I was hoping to get use of the old drive ( I need the data). I even did a system restore, but it still takes 5 minutes just to get into windows, another 3-5 minutes before windows explorer loads all it can, and my old drive is still not accessible.