how to copy files from knoppix /mnt/hda# to /mnt/sda1 ?

[joe]

.
I have my system booted with Knoppix 3.6 and I'm trying to 
copy some files from /mnt/hda6 to /mnt/sda1 (a flash stick) 
but when I do: cp -p /mnt/hda6/etc/fstab to /mnt/sda1/fstab.cp 
the response is: /mnt/sda1 is a Read-only file system. 
But the default permissions are -rwxrwxrwx knoppix knoppix. 

So, what else needs to be done in order to copy files 
to this flash stick. 

Joe