Unacceptable performance with USB3 flash drive on USB2 interface

Just purchased a 64G USB3 flash drive to be used with my old nc8230 with XP Pro. The notebook's USB2 interface works perfectly with all types of USB2 devices. However, writing and reading data on the USB 3 thumb drive is extremely slow. Loading it with 42GB of data (10000 files) took me 5.5 hours!!! Tests showed, that when reading or writing a file I see an initial delay of about 2 minutes until the transfer of data starts and seems to work perfectly.
I just updated the USB driver to the latest version available - no improvement.
Needless to say that the problem does not show up on other PCs - showing that the thumb drive is OK.
Handling the above mentioned 42GB data on my external 2.5" drive via the same USB port works perfectly as well (no delays).
Any idea? Thanks

Please cancel this question.
In case someone were interested here some more details:
In the meantime I made more tests and found out that the problem is caused by the new USB3 thumb drive and not the notebook. The initial good results on other PCs were caused by the point that I did not fully understand how to reproduce the failure. After this is now clear (primarily high latency times especially when generating directory entries but also when reading the directory structure), the problem showed up equally on another notebook with XP and a desktop with Win7.
I'm now trying to get a replacement.
Thanks, Dieter

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Thanks for taking the trouble to reply.
I eventually identified the problem. There's a power supply issue on the USB3 card on the desktop PC. Although the USB3 card has an additional power connector (to take a direct feed off the PSU wiring loom which IS connected and live), it clearly isn't getting through (properly) to the USB3 ports.
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