1) The following will be started by umounting/swap offing the correlating partition or
   device.

2) Remove memory key. Simulated by sending delete to disk block device.

   scsi_disk \ block \ block \   scsi
    0:0:0:0  /  sda1 /  sda  / 0:0:0:0
                       --+--
                         !
   unload sd_mod / sg ---+


3) Unload sd_mod driver chain.

   drivers \   class   \ module
      sd   / scsi_disk / sd_mod
                         ---+--
                            !
   unload usb-storage ------+


4) Unload usb-storage driver chain.

   scsi_host \# usb_endpoint #\   drivers   \    module   \    class    \   bus   \
     host0   /#    bounce    #/ usb-storage / usb_storage / scsi_device / drivers /

     bus   \  bus \   class   \  module
   devices / scsi / scsi_host / scsi_mod

   Note: Experienced endpoint "bouncing": cause remains unknown.

               remove              !               add
	 usb_endpoint  \  usb_endpoint  \  usb_endpoint  \  usb_endpoint
   usbdev1.2_ep81 / usbdev1.2_ep02 / usbdev1.2_ep81 / usbdev1.2_ep02