Well, HD-tach is freeware for personal use only - you gotta pay if you use it for magazine reviews/whatever. And you have to pay extra if you want write tests.
I think the error has something to do with BIOSes getting confused when there's both PATA and SATA drives in the system, especially if you have your PATA drive as primary master, and SATA drive in port #1. I had a LOT of trouble with my dads computer with sata disk + pata dvd as well.
I use nLite as well, and integrating their drivers - I
had to do that when I installed to my SATA RAID mirror, for obvious reasons (I don't have a floppy drive, and seeing your mirror as two individual disks isn't very helpful

).
I'm going to try moving the plextor to primary slave or secondary master, see if that helps...
And yep, access time is what's going to be most beneficial - though extra linear read speed isn't bad either
