Hello, I am building a computer for a sibling of mine for this Christmas, I've installed all my parts and saved a copy of the Windows installer to a flash drive. My bios is correctly setup. The HDD is 1 TB and uses SATA 3. My bios is set to AHCI and is programmed to boot of the flash drive first. The strange thing is, whenever I boot up the PC with the HDD plugged into a SATA port it takes up to 15 minutes to just load the first page of the Windows installer. However, if I boot it without the HDD plugged in it takes around 5 - 15 seconds. I have HOTPLUG enabled on the port I'm using (SATA 0) and can plug the HDD in at anytime during the Windows installation. It takes hours just to get to the "copying files" part and stays at 0% for longer than I was willing to wait before restarting, but if I unplug the HDD during the license agreement area it goes back to normal speeds. I have made a bootable USB of Hirens.Boot and that works at a normal speed with the HDD in or out. I've never used Hirens before but I think it has some sort of disk tester on it. Some help on how to use that would be nice. I'm not sure what's going on here, and could really use some help. Thanks guys!