If you want repeat a test, some detailed explanation is here: C. Connect to PC and answer "PC Suite" to mode question. D. echo host >/sys/devices/platform/musb_hdrc/mode You should see in /var/log/syslog a message "twl4030_set_host() after 4030 OTG_CTRL=0x26" - the '2' is a significant. E. echo H >/proc/drivers/musb_hdrc F. reattach USB cable from PC to self powered USB hub with memory stick or to external hard disk. E. Look into /var/log/syslog - You can see a lot of messages and two are most valuable - "Initializing USB Mass Storage driver" and " USB Mass Storage support registered". And in between you may see "scsi0 : SCSI emulation for USB Mass Storage devices".