Re: USB device class question by Tim
Tim
Thu Jul 10 02:05:51 CDT 2008
Kid <Kid@discussions.microsoft.com> wrote:
>
>What's the definition of USB group in Device Manager ?
It is designed for USB host controllers and USB hubs. It is also used in a
few other cases for devices that are "gateways" for other devices. For
example, I have a USB printer, and the printer lives in the Printer class,
but the "USB Printing Support" driver sits in USB class.
USB class has also been abused by many manufacturers to include generic USB
devices, but that's not correct.
>I see it have USB
>Controller or USB Hub driver or USB Mass Storage driver, I think these
>drivers are from different driver stack of USB , right ?
You might see USB Mass Storage support in the USB class, but if it's going
to be used as a disk drive, it will also have an entry in the Disk class.
>Why USB mass storage device use "USB" class but not an independent class , I
>see USB Network card use "Net" class and USB Mouse use "Mouse".
A USB disk often appears as several different stacked devices. The
accessible disk device will be in Disk class. Why are you worried about
this?
--
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.