newbie needs help for K3B and USB

Hello,

Need some help burning data from mine HD to a DVD-rom.
A have a corrupted HD but luckely my data is accessible.

Now I want to use K3B in Knoppix to burn my data on a DVD.
In K3B I only can choose for "local files".
I do not know how to to put files from my HD to a K3B project to burn.

Another possibility is to move all the data to an external USB harddisk.

Knoppix detected the USB port but how can I access my external HD.

Thanx for any response.
Japijo, The Netherlands