Maybe a stupid question but if I have http://www.amazon.co.uk/Hitachi-Hds721010cla332-3-5inch-7200rpm-Drive/dp/B002U22U6S would that drive be worth the investment.
Both 7200 rpm
Both 1tb
32MB vs 64MB CACHE.
You're not going to see a huge improvement 'upgrading' from one 7200rpm drive to another, better to buy an SSD if you want an 'upgrade'.