[CentOS] LiveCD on USB won't boot

HI,

I tried to build my own liveCD on USB-device. I've formatted my
usb-stick:

# mkdosfs -F 32 -n usbdisk /dev/sda1

Then I copied the iso-image to my stick:

# livecd-iso-to-disk CentOS-5.5-i386-LiveCD.iso /dev/sda1

After that I tried to boot with that new device:

# qemu -hda /dev/sda -m 256

But, then I become this error-message:

"Initial menu has no LABEL entries!"

The same shit happens if I try to boot my host with that usb-device? 

Any idea? Any hint 4 me? 


ttyl,
     Django
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