Has anyone tried an
eSATA drive?
' USB and 1394 external drives are ATA drives with a bridge chip that translates from the ATA protocol to USB or 1394 protocol used for the connection. These interfaces require en-capsulation or conversion of the transmit data and then de-capsulation after the data is received. This protocol overhead reduces the efficiency of these host buses, increases the host CPU utilization or requires a special chip to off-load the host.
The results of eSATA are dramatic and with no protocol overhead issues as with USB or 1394. The eSATA storage bus delivers as much as 37 times more performance. This ability is perfect for using an array of drives with performance striping behind the eSATA host port. '
My current system doesn't support eSATA, but I may well go for that option on the next one I build. Western Digital's list price for a 500gb MyBook with eSATA-3 & USB-2 connections ("Premium ES", $199) is $30 less than their 500gb with Firewire-800 / Firewire-400 / USB-2 ("Pro", $229), $20 less than their 500gb with Firewire-400 & USB-2 ("Premium", $219), and only $30 more than their 500gb with just USB-2 ("Essential", $169). Actual retail for the 500 ES is in the $150-170 range at the moment. Sounds like a win-win if you've got the hardware to take advantage of it.