I think i may have posted to one of those threads (not to sure) but the reason for taking the drive out is to be sure that you are installing to correct drive and so that nothing happens to the other one. Also in one post ME would not install at all with XP installed. The solution was to take the other drive and it was ok.
Take the drive out - You do not have to literally remove it, you can remove the power connector. Thats all.
Also the other method of creating a partiton can be done with FDSIK but FDISK is not very user friendly so removeing the drive would solve alot of problems. Using FDISK incorrectly can wipe everything.