I'm familiar with Ubuntu where USB devices are mounted at
/dev/bus/usb/xxx/yyy. Is there an equivalent for Mac, i.e. a file system location where all USB devices (not just drives in /Volumes) are mounted?
OSX is much simpler than Ubuntu, the only mount that will occur to USB devices' FSs is the one with mount point located at /Volumes. Even if every file system (which of course mounts as a folder) has some little differences from an actual folder. These differences make it appear as a directory transparently to the programs, but allow apps such as Finder to differentiate folders' and volumes' icons - for example.