Hello richardmg,
The RAW files created by the EOS Rebel T3 are approximately 16.7 megabytes in size. The camera couldn't physically make the images as large as yours because that data is derived from the amount of pixels.
It doesn't seem possible or likely, that over 450 gigabytes of data could be stored onto a drive that can only hold 200 gigabytes. This is like saying you store 450 gallons of water in a container which physically can only hold 200 gallons. The same principle applies to the memory card; one which is 15 gigabytes cannot gold 450 gigabytes. Based on this, the math simply wouldn't add up to this storage issue.
Perhaps this occurs when you process them in Adobe, I've seen situations where alterations to the file can create huge output files. It depends on the settings you adjust and what you do to the picture. If this is happening to you, I would highly suggest formatting the card, which will erase everything so back up what you want to keep, and taking ten test shots, in Program mode, ISO 200, RAW. Then transfer with EOS Utility and check the files. They should be much smaller than what you seem to have gotten before.
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