That's true for me, I have one.
I run a HD on the IDE 2, and two on the 3rd and 4th one. For most cases, whether you have one there or not, it will attempt to find one. BUt - what is it, about 15 extra seconds? Sheesh. Do what I do, turn the PC on, go to the fridge, by the time you get back it's ready to go.
However, you can do a search, and find some of us had problems with certain BIOS settings that would NOT let the RAID controller screen show up. For most it was a problem, but you might use it to your advantage, so check it out...