Original post by: Dan ,
The SATA connections are the same for both ports. The issue is one on what fits best and the ability of the system to cool. Apple has now started mounting the HD on the top bay so they have some reason in doing that (I don't know why). Some people think its easier for the assemblers to add the drive in others think its heat related. As the SSD runs cooler you could place it in the lower bay. Or you could just place into the top bay as its just easier to get to.