any solution for the sata1 problem on the 4810t ?
my postville is walking on 120mb/s read
One experiment to try is to boot to Linux off an usb-stick (eg, puppylinux). You can verify SATA-2 speeds with 'dd if=/dev/sda of=/dev/zero bs=1024K count=1024" -- it will report read speeds when finished.
If your configuration is like mine, you'll find Linux supports SATA-2 but both Windows drivers only manage SATA-1.