The ide port is usualy just that ... and not ultra (uses a 40 way ribbon rather than 80.
this means that it will be quite slow
and will need jumpering (master & slave rather than c/sel
the adapters come on both flavours ... pata>sata and sata>pata the difference in price ... well it could be made up in postage. (�12 is about par)
don't be tempted to mix optical and HDDs on the same chanel either .... you will always run at the speed of the slowest device)
how about a usb enclosure ... you can pay as little as a couple of quid .... and on a disc 160Gb or less the heat factor shouldn't be an issue on the fanless models. if you just use them for odds and ends
this sort of thing
http://www.google.co.uk/products?hl=en-GB&q=us b+hdd+enclosure&scoring=p
if you're not backing up critical data ... good enough