Hi I have a 160Gig as drive 0 and I installed a 1Tb drive that I installed Windows 8.1 WMC on about two weeks ago. I now want to remove the 160Gig drive. I have tried removing the drive and putting the 1Tb drive on SATA port 0 but it will not boot I used Computer Manager to set the 1Tb drive active. It shows as boot but still it will not boot from this drive. Once I put the 160Gig back in it boots fine. Is there any way to do this without reinstalling windows 8.1 WMC.