booting from cd and thumbdrive problem

hey there.. i've been trying to boot knoppix from cd and thumbdrive..
but, it keeps giving me the same error..
"Can't find KNOPPIX filesystem, sorry. Dropping you to a (very limited) shell. Press reset button to quit."

is anything i can do to boot it right?:confused:

First of all test your download like this example

Code:

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md5sum -c KNOPPIX_V6.7.1CD-2011-09-14-DE.iso.md5

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Test the burned CD with

Code:

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md5sum /dev/sr0

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or start CD with cheatcode

Code:

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knoppix testcd

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.

How did you manage the flash disk installation? With another CD?

ok.. problem resolved!!
i might burn my cd with highest speed..
when i burn it using slower speed, it works well... =)

Thanks!!