Western Digital has made a number of improvements on the original My Book with the Pro Edition. The capacity is a huge 500GB, and you get both FireWire 400 and 800 as well as the original USB 2 interface. The inner light on the circular power button now lights up in 17% increments to give an at-a-glance indication of how much space is remaining. Our speed tests produced some highly respectable results: 100Mb/sec for writing and 133Mb/sec for reading. You also get near-silent running, all of the cables you need to get started, and a price that’s only marginally higher than what you’d pay for an internal 500GB drive. For external storage and backup, this drive is practically perfect.
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