ed.vbox wrote:Had the same problem with VirtualBox 4.1.8 running Windows 7 Ultimate 64 bit on OSX 10.6.8.
To solve the problem I had to install Oracle_VM_VirtualBox_Extension_Pack-4.1.8-75467.vbox-extpack this is different than the Guest extensions (which I had installed as part of the original installation).
With the extension pack install I then was able to enable USB 2.0 (EHCI) Controller in the machine setting -> ports -> usb. I also added the device to the filter list. If the USB device gets mounted in OSx then I need to be ejected before it can be access by the virtual machine. Now I can access the drive without issues. Cheers.
Failed to attach the USB device Unknown device to the virtual machine .
Callee RC: NS_ERROR_CALL_FAILED (0x800706BE)
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