A few weeks ago after booting I noticed that my DVD_RW wasn't showing when I clicked "computer". No problem with any of the other drives. I moved the cable of said drive to a different sata port on the mother board & that seemed to do the trick. Now, when I boot, all drives are showing, however, after the system has been running & in use for awhile the same drive disappears. None of the other drives are affected. Could it possibly be the ports? The port I changed to is adjacent to the one not working. Windows 10 home 64-bit, Intel Core i7 920, Gigabyte EX58-UD3R, Corsair 12GB DDR3 @532MHz, AMD Radeon HD 6850, DVD-RW, BD-ROM, 1TB WD hdd, Creative X-Fi, Corsair TX-650w ps. Any ideas?