Disk Utility not resizing .DMG Image

I have an External HDD of 500GB I'm wanting to encrypt the contents, I though that .DMG would be the way do go so I made a 100GB Image on the HDD.
(Read/Write | Single Apple Map | 256-bit AES | OS Extended Journaled)
I moved some of the files into the Image to make room to expand the Image, then proceed to resize the Image.... only for it to do NOTHING!!
<log>
2009-10-08 19:52:10 -0500: Growing partition 0 of “Image.dmg” from 100 GB to 115 GB.
2009-10-08 19:53:47 -0500: Resizing “Image.dmg” was successful.
</log>
The .DMG is now 117GB's but the free space of the Image is still 100GB.
So what am I doing wrong, how do I resize the .DMG, or whats a better way to encrypt the HDD.
Thank you,
Chris

DO NOT use a regular disk image for this task. use a sparse image or better yet a sparse bundle disk image. unlike a regular disk image a sparse disk image only takes as much space on the drive as its actual contents. you can specify a huge maximum size for it at the creation time and you won't ever need to resize it. also, whatever you do, you need to back it up. that's always important but doubly so when storing stuff in disk images. disk images are susceptible to corruption and if an encrypted disk image goes bad it's pretty much impossible to recover anything from it.
Message was edited by: V.K.

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