IDE transfer setting

[mikeco]

in BIOS i noticed that the IDE drives i got can be set as 32bit but right now there set as 12bit, woundering what u guys use and can changing to 32bit make the harddrive heat up more or any thing? (i googled and a site said it can make the pc abit faster):unsure:

[Appzalien]

It won't cause your drives to heat up any more but my question is why didn't autodetect set them as 32bit? How old is this computer or hard drive?