Writing to USB drive

[t84a]

I get the error in Rufus:

The image is either non-bootable, or it uses a boot or compression method that is not supported by Rufus...

I downloaded a DVD zip file and used 7-zip to extract. 

I appreciate any help. Thanks

[cookiemonster]

some notes here https://docs.opnsense.org/manual/install.html

[t84a]

That's what I followed.

[cookiemonster]

ok, maybe a different tool would serve you better. Rufus is only one of many.