Since I don't see a solution on this page, I thought I'd chime in. I have the same need (eSATA port on my NVR and only USB drives) and I found the solution. It's StarTech, of course. Here's a link: www.bitly.com/2uKYTsx If you want to buy it, it's only $49 at Amazon: www.amzn.to/2tBR6i8
HTH