Hard drive shown as 2 disks - how to combine?

I've never cancelled or aborted a Clean All running process.
I don't know what might happen if you do that.
You could ask in the tutorial, Shawn Brink might know.

I would let it run however long it takes, probably overnight, and make sure i turn off auto sleep.

Clean All finished and diskpart continued to show the two parts of the same physical hard drive as two separate disks.

I have for now given up on this and formatted the two parts as two disks, one with 2 TB and one with the remaining 0.75 TB. Given the fact that Dell acknowledged in the meantime that their top of the line and high priced Alienware Area 51 desktop computer cannot deal with disks that are bigger than 2 TB this might be the best solution. See also here: 3 TB hard drive shows only 750 GB - Alienware Forum - Alienware Club - Dell Community

Thanks for all of your help! I certainly learned something today.

Just noticed your thread. Your machine uses BIOS. Only UEFI (the new standard that replaces the old BIOS) supports disks greater then 2TB. Looks like you have a BIOS based machine

ComputerGeek said:

Just noticed your thread. Your machine uses BIOS. Only UEFI (the new standard that replaces the old BIOS) supports disks greater then 2TB. Looks like you have a BIOS based machine

That's not true. Look at post #6