Knoppix 7.2 (CD EN) works nicely on both my Dell Inspiron 530 and Acer Aspire netbook.

The USB Flash Installer produces a flash drive that will boot the Acer, but which fails on the Dell.

Procedure: Booted CD Knoppix live on Dell. Invoked the Flash Installer and it wrote the 8 GB flash. When I booted the Dell and selected the flash drive, the Dell BIOS reported it as "USB-ZIP0" and gave "Boot error" when I tried to boot it. (Same with either the "p" or "i" options for overlay.)

I then booted the same flash drive successfully on the Acer netbook. The Acer BIOS saw it as "USB HDD".

This Dell BIOS is notoriously picky about flash drive formats, but I am running the latest BIOS. I have never successfully booted a USB-ZIP flash drive on the Dell.

I then tried using the same procedure I use to create bootable CrunchBang linux flash drives for the Dell. Dell BIOS reported seeing it as "USB-HDD0" but gave "No boot device available"

Here's how I wrote the flash device --
Code:
root@Dell:/home/xxx/iso/KNOPPIX_V7.2.0CD-2013-06-16-EN# ls *.iso
KNOPPIX_V7.2.0CD-2013-06-16-EN.iso
root@Dell:/home/xxx/iso/KNOPPIX_V7.2.0CD-2013-06-16-EN# dd if=KNOPPIX_V7.2.0CD-2013-06-16-EN.iso of=/dev/sdc bs=4M;sync
175+1 records in
175+1 records out
734937088 bytes (735 MB) copied, 94.0435 s, 7.8 MB/s
root@Dell:/home/xxx/iso/KNOPPIX_V7.2.0CD-2013-06-16-EN#
Suggestions as to how I might create a bootable Knoppix 7.2 USB drive for my Dell?