[all variants] Why Are Install Images Larger On My Drive Than On the Mirrors?

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http://ubuntuforums.org – Why are 12.04 install images larger on my drive than on Ubuntu's mirrors? I whined here and elsewhere last week that every 12.04 install CD I burned and tried failed to boot, producing an error message about needing to load a kernel. Today, someone told me that the images were simply too large for the CD's. Sure enough, they are. I see images typically sized at 695-698MB on the mirrors. But, when they're on my Mac's drive, they measure 730-732MB, too big for a 700MB CD. So, what accounts for the difference? Is it down to different file systems? (Hardware)