Startech eSATA/USB to SATA External HDD Dock

You’d think that four internal hard drive bays in my Mac Pro would be enough. But no, I also need to easily swap out external drives for backups and archiving. The Startech.com eSATA/USB to SATA External HDD Dock allows me to connect two large drives easily. It works with both USB and eSATA, if you have an eSATA card to connect it to.