10-22-2013
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You would not see it in /sys/block, block devices are disks. I used my hard drive as an off-the-cuff example of how to get the major/minor numbers. It might be found under /sys/class/tty/. It is full of virtual terminals which you can ignore, but will have serial ports as well.
Lots of devices these days include a little hard drive thing along with the device. It might have device drivers on it or promotional software. Or it might be something else entirely, when you can see the hardware the way Linux does some things just act strange.