This message occurring during boot up of KNOPPIX-Live has no deleterious consequences but it is an annoyance.
It is probably an unintended hangover from the HD-installed version which allocates several partitions.
Either ignore it or include a (2nd and) 3rd (and 4th) partition in your boot device, even if it is a USB stick.
Use fdisk* to set /dev/{sda}1 as the KNOPPIX partition type c (being FAT32; or NTFS if you prefer - I've never tried this).
Set /dev/{sda}3 as type 83 (Linux) (at least 400M). Then format it as Reiserfs with mkreiserfs .
It's not obvious to me how (or even whether) the partition is used; but it is made available; and you will boot
without the annoying error message!
(*) Yes: you need to format your intended USB device - from a temporary KNOPPIX USB device is probably your most
convenient method ;o)
VINTAGE, HARMAN KARDON, MULTIMEDIA COMPUTER SPEAKERS Tested Good
$25.00
Vintage Compaq Armada 100S Laptop
$89.99
Vintage Apple Mighty Mouse Wired White Model A1152 MB112LL/A SEALED in Box 2007
$48.99
Vintage Apple 2 Floppy Disk Drive And Interface Card
$150.00
Vintage IBM ThinkPad T23 Pentium III Windows XP Laptop w/ Charger - Runs Great
$99.95
Vintage Texas Instruments TI TravelMate 2000 286 laptop parts/repair 0259
$30.00
VINTAGE DELL INSPIRON B130 WINDOWS XP HOME LAPTOP DVD WIRELESS Needs 2 Keys Wrks
$80.00
Vintage Dell 320SLi subnotebook laptop 386SL-20 parts/repair
$30.00
Vintage Dell Precision 420 MT - Intel Pentium II 866MHz - 384MB Ram - No HDD/OS
$149.99
Vintage Dell Precision 410 Intel Pentium II 600 MHz 768 MB Ram I No HDD I No OS
$129.99