... all tested with CD 6.4.4: after start of "install KNOPPIX to flash disk" and your [Ok] the USB-Stick will be (quick-)formatted within 1 second. Writing data to stick needs time of ca 4-5 minutes; you'll see the progress in "%". After that you get for about 4 seconds the message, to unplug the stick and the window of flash-install disappears. That's all!

After booting with the stick and if there is no persistent memory, you get the prompt for creating it. You have time of 8 seconds to write size of memory. You'll get this message each time you boot the stick untill you create a persistent memory (or using cheatcode "noimage").

If you decide to create persistent memory, formatting needs a long time!!

Greetings Werner * http://www.wp-schulz.de/knoppix/summary.html
Own Rescue-CD with Knoppix (Knoppix V6.4.4 remaster)