Hello, im having a similar problem.. In my case, transferring large files (like over 1 gb) over usb drives freeze the system. I get no slowdowns, no error messages, the pc just freezes during the transfer and requires a cold boot to work again. All other usb devices work so its definately related to usb storage devices only. Strangely, usb thumb drive and/or hard drives work after the reboot, given the system boots up with the storage devices connected, and i can then move the files.. Im running win 7 64-bit on an amd phenom 2 system with 790fx chipset.. updating chipset drivers and mainboard bios didnt help. Any suggestions??
Thanks..