WD intros 4TB My Book Studio Edition II external hard drive

What a difference a year makes, right? Right around 12 months after Western Digital outed its 2TB My Book Studio Edition II, the company has come forward with a new edition that houses twice the storage. The dual-drive device includes a pair of those minty fresh 2TB HDDs arranged in a RAID 0 configuration, and WD promises that it'll play nice with both Macs and PCs. As for connectivity, you'll get eSATA, FireWire 800, FireWire 400 and USB 2.0, and the handy capacity gauge does exactly what it says. It's up for order right now for $649.99.