Does anyone know of the largest sized eSATA powered hard drive that's available (e.g., is there one as large as 640Gb that anyone knows about; again I'm hoping for one that's eSATA powered....I'd rather not carry along a power supply chord). I have the Dell Latitude E6500 laptop which has an eSATA slot. Even more, has anyone tried the load speed of RealTracks and/or RealDrums using such a drive.....particularly in comparison to a USB connected hard drive? Regardless, I need additional storage whether or not the RealTracks or RealDrums load faster or not......based on brief checking, in general the transfer speeds of the eSATA drives are significantly faster than via USB......I assume this would be beneficial if the RealTracks and RealDrums resided on such a drive. Pro and con experiences of any kind regarding eSATA hard drives would be greatly appreciated.

Thanks in advance,
cchallum