You can connect the - the first hard drive`s jumper should be on master the second 1 should be on slave and the third 1 on cable select or slave am not sure about that but try to connect the third one as cable select .
Well which operation system are you gonna be using ? If you dont have any operation system on any of the hard drive for your computer the , than install an OS on the 40 gb and note that the hard drive should be on master and then the second hd better be the 100 gb put it on slave and the plug the power hd cable and IDE cable for the hd and the u got to use the IDE2 for the third hd and the jumper should be on cable select .
it was pretty hard lol. i got help form my dad.....i made the 100 gb the master with the 40 gb slave on IDE 1 and 20gb master with the cd burner slave on IDE 2.