Welcome to the forum. I had not realized that there was a simpler way to change the rw status of a flashdrive. What I usualy do is change mount the flash drive from root. You have to remember though to unmonut it from root also. the cmd I use goes like this in Knoppix 3.8,9 .. first you right click and mount the flashdrive then (use the expression withut the quotes.
" mount -o remount,rw /dev/sdf1" or possibly "mount -o remount,rw /mnt/sdf1" then you can write to it or drag and drop. I hope this helps. the unmount would read something like " umount /dev or mnt/sdf1" I too am new to this forum and wish you happy learning.
Captain Cautious