OK so here's a strange one. I can't use all 4 bays at once. I can only use 3 of them. Right now I have the top three bays in use. Top two are 2 velociraptor drives in RAID 0. Under them is my Mushkin SSD OS drive but the bottom drive (agility 2 SSD 64Gb) is not detected. Here's the spin. If I take out all the drives and put the agility 2 SSD drive on the bottom tray, my bios detects it and so will windows. But the instant I use all the drives the bottom one disappears in the bios and in windows. Has anyone else had this issue?