Understanding HP-UX 11i v2 and v3 USB ioscan

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DVD. The DVD is a virtual connect mass storage USB device, and its
associated SCSI interface sdisk node is at SCSI target 0.
USB Attach/Detach
USB devices can be dynamically attached and detached.
Attaching/detaching occurs when the USB device is physically plugged
in/out of the USB port. As USB devices are attached, the USB device will
automatically appear in the ioscan, and when they are detached, the
device node will disappear from the ioscan. When a USB Mass Storage
device is detached, both the USB Mass Storage device node and the
associated SCSI target sdisk node will disappear from the ioscan.
WARNING: do not detach a USB mass storage device that is currently
mounted. Unmount, then detach.
From the previous sample ioscan, after detaching the Drive Key II device,
for example, the ioscan would show both the “USB Mass Storage [1]” and
“USB Mass Storage SCSI” target 1 nodes destroyed:
Class I H/W Path Driver S/W State H/W Type Description
========================================================================
…
usb 0 0/0/2/0 hcd CLAIMED INTERFACE NEC OHCI Controller
usbcomp 0 0/0/2/0.1 usbcomposite CLAIMED DEVICE USB Composite Device
usbhid 0 0/0/2/0.1.0 hid CLAIMED DEVICE USB HID Kbd(0)
usbhid 1 0/0/2/0.1.1 hid CLAIMED DEVICE USB HID Pointer(1)
usbms 0 0/0/2/0.1.2 ms CLAIMED DEVICE USB Mass Storage [0]
usb 1 0/0/2/1 hcd CLAIMED INTERFACE NEC OHCI Controller
usb 2 0/0/2/2 ehci CLAIMED INTERFACE NEC EHCI Controller
usbms 3 0/0/2/2.3 ms CLAIMED DEVICE USB Mass Storage [2]
…
usbmsvbus 0 255/0 mass_storage CLAIMED VIRTBUS USB Mass Storage
ext_bus 1 255/0/0 usb_ms_scsi CLAIMED INTERFACE USB Mass Storage SCSI
target 4 255/0/0.0 tgt CLAIMED DEVICE
disk 7 255/0/0.0.0 sdisk CLAIMED DEVICE HP
target 3 255/0/0.2 tgt CLAIMED DEVICE
disk 6 255/0/0.2.0 sdisk CLAIMED DEVICE HP DVD Writer 630c
Systems with no USB hardware
In the case that the system has no USB hardware, the VIRTBUS interface
nodes will still be present:
usbmsvbus 0 255/0 mass_storage CLAIMED VIRTBUS USB Mass Storage
ext_bus 3 255/0/0 usb_ms_scsi CLAIMED INTERFACE USB Mass Storage SCSI