I am using both Knoppix 4 and Knoppix 5 on the same computer.
I have Knoppix 4 using persistent home, knoppix.img on HD.
Knoppix 5 always asks if it can use it/write to it.
If Knoppix 5 looked for knoppix5.img FIRST I could use persistent home
with it without removing the K4 home.