Recently I recovered a lot of CR2 files from my HDD in RAID setup. I got the CR2 files and their size seems OK. In windows explorer and in Irfanview I see the complete picture. In Bridge the Preview shows the picture completely for a very short time and then after part of it becomes white. After opening in Camera Raw and Photohop the pictures remain partly white. To imagine it better, the pictures look like there has been put a white paper in the corner on top of them.
Have you tried opening them in Canon Digital Photo Professional?
Just did, and the result was that the preview is fine. Thumbnail looks good, but after opening the same parts of the picture are white, like in Bridge and Photoshop