LaCie announced its new 4TB Thunderbolt/USB 3 Rugged RAID portable hard drive ($420 list, $399 Amazon) today, and I’ve had some time to take it for a little ‘spin.’ There are two speedy 7200RPM 2TB portable hard drives RAID-ed together inside to give the device very impressive, almost SSD-like speeds but with the cost savings and huge storage of portable hard drives. At the same time, the package isn’t much bigger than a regular portable hard drive and better yet, it can take a serious beating…

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