I got this one for $16 (no enclosure for your old CD-ROM like the $80 one): http...

I got this one for $16 (no enclosure for your old CD-ROM like the $80 one): http://www.amazon.com/gp/product/B0058AH2US/ref=oh_details_o...

Left some big files on the old HD, and symlinked them. The disk stays idle in the CD bay until I need it, then spins up.