Have a second desktop PC which isn't much used - but is handy when needed. Is similar to my main one, having dual boot with two HDs - one XP, one Win7. Used it a few weeks ago and discovered the XP HD had failed. And just now the Win 7 one. Both were bought at the same time and are identical. Can't remember where they were bought and when.
What is the best make to go for these days? A quick glance on Ebay showed a 500Gb or so to cost an arm and a leg.