Hey tecmo thanks for your reply.
I've found that bit, but that only allows me to set the boot order/which drive to boot from (and I've selected the exact drive I want it to boot from). But during/after (I don't really know which one), it still counts the memory and 'auto-detects' the HDD and optical drives.
I've had a pretty thorough look through the manual and the BIOS itself, I'm guessing I can't stop it from auto-detecting. No biggie though, just thought I could speed up my bootup a little bit more