Thanks guys, my 1 year warrenty came and went a long time ago. I only wish I'd saved myself a lot of pain and bought a good UPS from the very beginning. I think it should be in the instruction manual as a strong recommendation to all. "Don't want your Quad to go up in smoke? Get a UPS!"
Anyway, powering down my Quad now and will try and buy the same drive. Thanks to you both!