Ok, I'm going to disable UEFI-CSM and enable Secure Boot. I disabled/enabled them a few years ago to test a Linux distro. At that time, it was necessary to disable Secure Boot. About trying to boot with both disks connected: what you're trying to tell me is that Windows might not start normally and because of that it would automatically run "Fix Boot Problems" and this could cause adverse consequences? Or is "Fix Boot Problems" a Macrium feature that I would use manually? If this is a feature of Macrium and I really need to use it, I understand that I will be forced to disconnect the SATA cable. I'm reluctant to tinker with cables because my GPU or my MOBO is dying. Sometimes, after I open my PC to clean or do something, it does not turn on and beeps a GPU-related error. I do not know if the problem is the MOBO's GPU slot or the GPU itself. To fix this, I close the case and (with the PC off) move, millimetrically, the GPU, using the DVI cable that is plugged into it, to "fit it better" into the slot, and try to boot. Sometimes I get it working in a short time, but at other times it takes hours. I know I need to sort this out, but since this rarely happens, I do not want to worry about it now.