Installation ISO difference: Which to download?

What is the difference between these two files from the download page? The two were are the following:

FreeBSD-8.1-RELEASE-i386-disc1.iso 645 MB 7/19/10 12:00:00 AM
FreeBSD-8.1-RELEASE-i386-dvd1.iso.gz 1.9 GB 7/19/10 12:00:00 AM

I'm new to FreeBSD and want to test it out. Which one of the two should I download? Are the contents of those two files the same? I was thinking probably not as they differ almost triple in size.

Please help.

Thanks.
 
Also note that disc1 + livefs < 900 MB and the packages on dvd1 may not be worth downloading almost 2 GB if 1) you'll install newer packages or 2) you'll install from ports.

The only disadvantage is that you need 2 CDs instead of 1 DVD.

Or you could use only 1 CD for livefs, download the contents of disc1 separately* and do a manual installation.
The whole thing would probably be less than 500 MB.

* e.g. base, catpages, doc, info, kernels, manpages and src. Only base and kernels are needed, the rest is optional.
 
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