I recently bought both this hard drive and disk drive. They both have the small sata ports on them so I have connected the supplied two sata cables to them. But there is a bigger slot on both on them in the L shape. I believe this is the power cable but I can't find anything which feels right to plug in.
http://www.overclockers.co.uk/showproduct.php?prodid=HD-025-TS
http://www.overclockers.co.uk/showproduct.php?prodid=CD-099-LG&groupid=701&catid=10&subcat=
http://www.overclockers.co.uk/showproduct.php?prodid=HD-025-TS
http://www.overclockers.co.uk/showproduct.php?prodid=CD-099-LG&groupid=701&catid=10&subcat=