I don't tell about additional USB drive !
All of Live Linux ( That i tested such as knoppix , slitaz , slax , ... ) When booted from pendrive USB , Mount its USB media as RW .
You could create an USB bootable Linux ( such as with unetbootin or pendrivelinux or ... ) and see that it mount its media file & folders ( /dev/sda1 ) as RW !
I wish i explained good my problem .
Last edited by mbzadegan; 03-10-2013 at 12:11 AM.