USB Image not booting Panic:Root mount failed

[hot_powerz]

I used the guide to burn a img to a 4G usb stick. Now I am trying to boot this USB on my laptop. but it stopped on a screen like:
mountroot>
panic:Root mount failed, startup abouted.
cpuid=0
KDB: ENTER: PANIC
[thread pid 1 tid 100002]
Stopped at kdb_enter+0x3d:movq $0,0x6637a0(%rip)
db>

please help to identify the issue and give me some advise.

 

[cyberjock]

Usually that means a hardware fault or incompatible hardware. Things I'd try:

1. Try using the USB stick on a desktop. If it boots then that pretty much rules out a bad install of FreeNAS or a bad USB key.
2. Try a different USB(preferably use a 4GB+ drive because some 2GB drives aren't 2GB which will cause stability problems)
3. Try reinstalling FreeNAS to the same USB and see if it starts behaving.
4. Update the BIOS on your laptop. Try disabling all hardware you won't be using in the BIOS. Also you can try just resetting to defaults.

 

[hot_powerz]

Thanks for the response. When I plugged the USB to the PC that will act as the real NAS, the usb image is working fine. It might some compatibility issue between freenas and my labtop (Lenovo N585).