usb 2.0 cd-rom stops burning

Hello everyone.

I have been using a Polaroid cd-rw usb2.0 drive for some time on a
usb1 port with no problem. Just lately I bought a usb2.0 pcmcia in
order to use this drive up to 48x burning (that makes a defference
with the previous 8x usb1 capability) I installed the pcmcia correctly
and seems to work fine, but when I try to burn on the cd drive, it
begins fine, but after some time (at about 80%, but it's variable)
drive seems to keep on burning forever and burning progress on Nero
stops at that percentage with no error. Nero seems to keep burning,
and drive too, but percentage doesn't move any more and Nero hangs.
If I try to burn the same cd through usb1, all works fine.
My Nero version is 5.5.9.9, but I don't think it's the problem. It's
more likely a hardware cd-usb2 conflict.

Can anybody help?

Thank you ;-)