The addresses are exact hardware locations
For example when I run cat /proc/scsi/scsi I get:
----------------------------------------------------------------------------
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: Slimtype Model: COMBO LSC-24081M Rev: 3GM7
Type: CD-ROM ANSI SCSI revision: 02
----------------------------------------------------------------------------
This just gives hardware addresses. You will need to map the /dev/usb portion to /dev/scd0 in order to mount the drive and define it in /etc/fstab
Try installing the app usbview-1.0-i686-1jto.tgz from
http://linuxpackages.net and see if that will provide some more information about what is connected to your usb ports.