Quote Originally Posted by vkrishn View Post
Suggesting but not recommending:
1. How about re-mounting knoppix-data.img as readonly.
2. Then creating new Union with KNOPPIX and directly compressing the new Union.
I think this procedure can be scripted.
The way Knoppix-data.img file system is mounted/structured, you can't remount it as read-only, you will get 'busy' error.