i posted this in snow leopard forum, but i got no response. maybe it was in the wrong forum, so i will try again here.
i get very slow speed on usb transfers, on usb sticks and external hdd. works great from linux on the same computer. my guess is that the usb ports are working in usb 1 mode, not usb 2. i tried vanilla snow install (well, patched kernel and a few kexts, and hazard leo, but no luck). i get the same slow speed with ipc and various other leo distros on 2 different intel pcs. haven't tried snow leo on them. can anyone help? thanks.

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CPU: AMD Athlon 64 X2 5000+
RAM: 2 x 1 Gb
2xSATA HDD
ATA DVDRW
MB Asus M2N Nvidia MCP61
Video: GeForce 8600 GT 256 Mb RAM
ADI 1988 onboard audio
Audigy soundcard
Realtek lan