It doesn't matter so long as you have one on the SATA-0 port for your boot drive. After that, just pick whichever one's easiest to get to.
hi there i`ve just bought a new hard drive to use as storage it is a seagate 500 gb ,i already have a 300 gb drive in the pc they are both sata ,now then the problem i have is ,there are 6 sata sockets to plug
the hard drives into, which sockets do i use,also do i have to change anything in the bios . thanks