That doesn't work since Storage Cards are formatted as FAT16 most of the time. That means you have a limitation on the number of files in a single directory. Not to mention you would be wasting a certain amount of space on every file because of the cluster size/file size differences.

I am talking thousands of tiles here like enough to cover several National Parks and National Forests at 2 meter per pixel resolution if that makes things more clear. Thanks for the DBM idea never heard about those.