That was fun. I actually saw the searching of the iso image for KNOPPIX. I first booted using the dvd. then in a terminal window I typed sudo fdisk -l (list) and found this for both 64gb and 16gb usb drives.

Disk /dev/sdd: 62.8 GB, 62813896704 bytes
64 heads, 32 sectors/track, 59904 cylinders, total 122683392 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdd1 * 1 81631231 40815615+ c W95 FAT32 (LBA)
/dev/sdd2 81631232 122683391 20526080 83 Linux
knoppix@Microknoppix:~$

Disk /dev/sdd: 16.0 GB, 16008609792 bytes
64 heads, 32 sectors/track, 15267 cylinders, total 31266816 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdd1 * 1 8433663 4216831+ c W95 FAT32 (LBA)
/dev/sdd2 8433664 31266815 11416576 83 Linux
knoppix@Microknoppix:~$

I then booted with the dvd and at the knoppix penguin I typed knoppix bootfrom=/dev/sdd1/KNOPPIX/KNOPPIX and here is where it says, searching ISO for KNOPPIX ?