high speed bus- not found external hdd

Hi There,

I've external usb hdd, it works on my usb drive. But i've had a problem with
slow write
to fail . The after investigation on net, i bought hig speed usb controller
bus
for high speed connectivity to my external hdd.

i connected my hdd to high speed usb, now it's not finding my external usb
hdd. i can see unknown device. But it was found when i connected to usb
drive directly.



Thanks for your help

Ganesh