Manufacturs tend to write their specifications at the time of product development or right at release and they say the largest drive supported is the largest one they actually sell through their channels at that time. They of course want you to buy their branded hard drives. At least this is what I have noticed. It should have no problem taking larger drives.
With older IDE drives back when capacity was getting beyond certain sizes, we did have drives that were beyond spec of the controllers and you either only saw only a portion of the drive or not all all when you tried to use too large of a drive. This is not the case with newer sata drives at this time.
If for some reason the internal controller did have issues with larger drives, the only way to get around it is use a 3rd party controller card. Once in awhile, bios updates will fix/update certain issues also.