Heads up - minor usb disk key probing change

[Matthew Dillon]

:As about the serial number, many USB sticks produced in China do not
:have a valid one (something like all zero)
:
:Best Regards,
:sephe

    Most of the sticks do not appear to support the serial number
    inquiry page.  I get nothing when I plug them in.

    I have verified that a real external hard drive connected via USB
    does probe the serial number.

    In anycase, I shifted all the usb attachments to da8 and greater
    so it shouldn't create any confusion if the system has less then 9
    real HDs.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>