I have moved mine into the 51/4 inch bays at the top of the my tower system. I used floppy disc mounting kits I got from PC World. With a bit of carefull filing to extend one set of holes it did the job perfectly. Cost about £10.00. If you want to really cool things down PCW (and others I'm sure) provide proper HD mounting / cooling kits from about £12 / HDD to around £30 /HDD. This provide cooling / sound damping and fit directly into your 51/4 inch bay. Just moving the HDD cools the whole system down if you have a large enough tower. I'm sure the cooling kits work well - I just couldn't justify the cost as a pensioner.