external hard drives

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I'm looking for advice on a good external hard drive, preferably with both USB and Firewire connections. Something below 20 GB is plenty adequate (below 10 would even be good too). On an initial look I found a 20 GB USB/Firewire drive for $185. 20GB BUSLink DISK-ON-THE-GO? Pocket Size Slim Drive Any comments on price v. quality here? I've never looked into external storage before, so I don't know all the big contenders, etc. Any help would be great. Thanks a lot.