Handy for expanding to USB 3.0 speeds,
This review is from: Seagate FreeAgent GoFlex USB 3.0 Desktop Adapter and PCI-E Adapter Card (Accessory)
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This dock works with the Seagate GoFlex Desk hard-drives. The concept is quite simple - the hard drive can be detached from the data transport mechanism. This means the same drive can work on USB, Firewire, USB 3.0 or newer connectors such as Thunderbolt.
This kit contains everything you need to get going with USB 3.0: a small PCI-E card for USB3.0, a cable, the dock and a power supply. I have used it one a windows PC and also a Ubuntu Linux PC. I'm not entirely convinced by the concept, but this is a good way to get external USB3.0 capabilities, which is much faster than USB2.0, and it shows!