Installing a second dvd drive. when you say old jumper cable in master,do you mean the jumper that

Question

when you say old jumper cable in master,do you mean the jumper that came with the computer or the one i should add which would be a typical old jumper,and iff so do i need to link both drives together or can i go second drive slave then straight to computer without linking,or would it have to go drive 1 (m) drive 2 (s) then computer?