Any time you use an adapter to go from one type of connection to another you are losing speed, period. The speeds you are thinking of are when you use the correct connectors with the correct devices. Also, if you're going from a faster medium, which you claim, to a slower medium, which you claim, you're creating a bottleneck. With the DirecTV DVRs you need to use an enclosure that already has eSATA. Not some rigged up concoction where adapters are used.