I purchased an external seagate hard drive (FreeAgent 500gb) The drive had two external connections USB 2.0 (480MB) and eSATA (3GB). I had to spend about $30 to buy a cable interface for a motherboard to Seagate connection. After installing the eSATA connection I saw no improvement in my data transfer rate. The USB 2.0 and the eSATA were about the same. I contacted Segate (got India) an inquired about the buffer to disk transfer speed. The tech kept quoting the Host to buffer transfer speeds. I explained I would like the disk to buffer speed, "we got disconnected" Ha!. My 2nd try a very nice lady answered and I went through the same routine, only she stayed with and finally gave me a speed of 49mb/sec, which was about right. I returned the hard drive to the dealer. I then looked into the Western digital (WD)external hard drives (My Book, Studio edition) which also has USB 2.0 and eSATA connections. I am a long time customer of WD and I notice very quickly that they don't publish the Transfer rates (Buffer to Disk) for their External Hard drives. They publish the rates for all of their internal drives. My question is how much can an eSATA connection really improve your true data transfer rate over an USB 2.0 connection. I am pretty sure the drive does'nt increase it rpms when you make an esata connection. I sent an email to WD, Its been 3 days no answer. I would like to hear some opinions on this subject. Take care.