hi i have an eclipse msi motherboard with 8 hard drives: 1x120gb ssd, 3x2tb, 3x1gb and 1x1.5tb. i recently installed an internal sata dvd drive but everytime i connect the dvdrw, one of the hd disappears. bios can detect all of the drives including the dvdrw. os is windows 7 32bit. your thoughts? thanks.