Why can't i run card reader+flash drive at the same time?

[Guest kimiraikkonen]

Here is a strange problem:

First i've thought that it was because of Win2k's crappy drivers, then

upgraded to XP SP2 Pro but the same problem, if i connect flash drive

with my SD card reader (USB), the flash drive will not be recognized

any longer. But if i run it alone or other USB devices like USB

gamepad or 2 USB flash drive, it works OK. I also tried different

ports with no help, the other USB devices or this USB devices works

well with another system when connected together.

 

I've checked system info with no conflict, only there are some IRQ

sharings which haven't been problem since i plug card reader with

flash drive at the same time.

 

What should i do?

 

Please help

 

Thanks.