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I am trying to make a 3D looking disc, sort of like this:

Glossy Recycling Icon | Royalty Free Stock Vector Art Illustration | iStockphoto.com

or

Throwing a Disc | Royalty Free Stock Vector Art Illustration | iStockphoto.com

However, I would like the disc to look as though it is laying flatter (more of a side shot).

Here is where I have gotten so far:

http://okcthundercast.com/media/disc.png

I'm fairly happy with it, but I would like the sides to look more perpendicular to the top, rather than rounded. Another example of what I'm going for is:

Yogpot Gels on Flickr - Photo Sharing!

but again, more from a side view. Can someone give me a nudge in the right direction? How can I make the sides look flat instead of curved?

Thanks a bunch!

Michael