I store my personal documents in a 128bit encoded .dmg file, which is password protected (good old porns
I finally faced the problem, that I’ve grown out this image - but i had no place to create a new one and copy over the contents (I was working heavy on a dvd edit) - so i RTFM.
hdiutil resize -size nn[m|g|t] mysecret.dmg

Thanks for the post. Useful stuff.
Thanks for the tip. Saved me a ton of trouble on Leopard.
First hit on google, too.
Cheers.