Thunderbolt’s transfer speeds are a good ways past what eSATA can offer. That said, if you’ve still got an eSATA drive, and it’s still good, no reason to throw it out just yet. Kanex has a new adapter that makes your Thunderbolt port friendly with eSATA connections.
If you have a Mac or one of the few PCs with Thunderbolt ports, this adapter lets you convert it into an external eSATA port. There’s also a USB 3.0 port on the adapter, so you can attach a second storage device or a peripheral. It’s too bad there’s not another Thunderbolt port on there, especially if your Mac or PC only has one Thunderbolt port. Can’t have everything, I guess!
You can buy the Thunderbolt to eSATA Adapter straight from Kanex for £80, which comes out to about $140.