What's in a (device) name?

[Sergey Babkin]

>From: "M. Warner Losh" <imp at bsdimp.com>

>usb assigns addresses dynamically.  Everyone else does it basically
>statically.  PCI slot/device numbers are static, but extreme
>configurations can change the bus number.

Some USB devices (though not all of them) provide a unique
device ID. If this ID is available, binding to a particular
device is straightforward.

The problems start when the device get replaced. For example,
an USB printer dies and you replace it with another one.
Form a tech support standpoint it's convenient if the new 
printer gets silently recognized as a replacement of the
old one.

-SB