Hi, I had the same problem. Tested a lot. My solution to passthrough usb devices to a windows 7 x64 guest:
parameter part: -device usb-ehci,id=usb,bus=pci.0,addr=0x4 -device usb- host,vendorid=0x{},productid=0x{},id=hostdev0,bus=usb.0 I also tried the device piix4-usb-uhci instead of usb-ehci piix4-usb-uhci caused the Code 10 error in the windows device manager. lsusb will give you a list of plugged in usb devices. eg. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub 1d6b:0002 and 1d6b:0003 are vendorid:prouctid replace {} with the ids and it should work. I tested it with - ssd usb 3.0 drive - retail usb seagate usb 2.0 hdd drive. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/685096 Title: USB Passthrough not working for Windows 7 guest To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/685096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs