I have a 3TB drive that is currently in MBR format, so I can only see 2TB of it. I used MBR because I didn't have a UEFI BIOS, and Windows won't boot from a GPT drive without UEFI. I figured I'd fix it after I bought a new motherboard on Black Friday. So my new motherboard is here, and I want to convert the drive to GPT and get my extra terabyte back. I have Paragon HDM12, and it has an option to convert drives from MBR to GPT without deleting the data. My questions are: a) Has anyone done this, and can you confirm that it doesn't destroy the data on the drive b) Does it do this quickly, by just rewriting the partition tables and boot sector, or does it have to copy and rewrite the data --- kind of like the difference between a quick format and a full format. If it takes a long time, then I'd just as soon copy the data to an external drive and start fresh. Oh, and I know I'll have to reinstall Windows, but that's OK; it's in a separate, small partition. It's my data partitions that I'm worried about. Thanks for any help.