Re: How windows differentiates multiple USB devices of same type?
- From: "Doron Holan [MSFT]" <doron.holan@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2009 10:59:03 -0800
there are really two things going on here. first is how the device identifies itself with its VID and PID. each vendor has their own pair so that automatically gives them their own identity that is separate from each other. second is how the device itself with a unique identity, ie how to tell the difference between 2 devices which have the same vid / pid pair. in the case of 2 devices with the same vid / pid, if the device has a serial number, it provides unique identity. otherwise, the identity of the device is based on the usb port (and up stream topology) it was plugged into
d
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"kthread" <kthread@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:FB900281-1DEE-4FE8-B7BA-A3A9ED649BDB@xxxxxxxxxxxxxxxx
Hi,
Am new to drivers. I wanted to know how windows differentiates
multiple USB devices of same type. Eg USB stick from a vendor. if we inject
more than one USB stick of same vendor, then how windows will identify that.
As far as i know in linux it is easy with Major and minor numbers with sub
class. Is it same on windows also.
If it is same is there any possibility to get Major and Minor numbers for
the two usb sticks.
Please help me out and correct me if am wrong any where?
.
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