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I've only used the 400GB and 500GB models...rock steady.

You also might be interested in the Bigger Disk Extreme. It's 1.6TB of storage. Look around LaCie's site.
 
Thanks for that - I've actually decided to go for the "rock steady" 500Gb, as I've read a couple of reviews that say the 1TB (and presumably the 1.6Tb) can be a bit noisy because of the fan, and I'm a fan of peace and quiet...
 
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