Seagate has recently released a Thunderbolt adapter for its GoFlex series of portable external hard drives that is as big as an external hard drive on its own. The GoFlex Thunderbolt adapter works with all GoFlex drives adding a super fast Thunderbolt port with transfer speeds of up to 10GBps. Also, the GoFlex Thunderbolt adapter requires no external power to run and is compatible with any 2.5" SATA drive including SSD drives which will yield the fastest capable transfer speeds. Seagate's GoFlex Thunderbolt adapter is the most expensive interface adapter available for the GoFlex system at $99.99 and doesn't even include the necessary Thunderbolt cable which costs $50 alone.