[SOLVED] USB sources not loading

[Tim Curtis]

Are u using a powered USB hub?

No .  I use a  simple 4 ports hub , one port for the pi , two for the sticks and one for a usb DAC which works just fine . 
From the moment that they appear connected , shouldn't they load as well  ? I see sda1  & sdb1 partitions  at the /dev but they appear unmounted for some reason . 
Could it be that they are simply recognised but there is not enough power to scan them and mount them  ? 

Thanks

Try a test with just one USB drive plugged into the hub. Reboot and see if its auto-mounted.