Updated: Thunderbolt 2 vs USB 3.0 vs eSATA

Introduction and speedThe high-speed Thunderbolt standard has been given a huge upgrade, and it can now deliver twice as much data through a single channel. But it isn't the only high-speed connection available: there's USB 3.0 and eSATA too. How do they compare, and what are they best for?Thunderbolt 2 vs Thunderbolt 1: What's new?The second generation of the Thunderbolt standard combines DisplayPort and PCI Express data and is faster than its predecessor – it can drive a 4K display with a si