USB install problem (BT3)

[lupus7]

Hi!
When I try to install MBR on my USB flash (with bootinst.sh) I have a such error:
Flushing filesystem buffers, this may take a while...
Setting up MBR on /dev/uba...
Fatal: /dev/uba is not a master device with a primary parition table

A have marked /dev/uba as bootable (but didn't find how to make it primary ) - doesn't help
I've changed the script to install it on /deb/uba1 (first partition) and not /dev/uba. It succeeded, but the computer can't boot from him.
Any help will be appreciated.

[lupus7]

Ok, I fixed it by switching to windows and running bootinst.bat script
But it's interesting what caused such LILO errors..