To ensure that the Compact Flash card is formatted using FAT16, you must upgrade using a CF card at least 8MB in size and no larger than 2GB, and then format the card in your camera. For one thing, it recognizes only Compact Flash cards that have been formatted using an organizational system called FAT16 (which again, you might be familiar with if you're comfortable with hard disk technology). After the new firmware has replaced the old, you can turn off your camera, and then turn it on again, and the updated operating system will be loaded.īecause the loader software is small in size and limited in function, there are some restrictions on what it can do. The loader's function is to look for firmware to launch or, when directed, to copy new firmware from a Compact Flash card to the internal memory space where the old firmware is located.
Not ironically, that's almost exactly what happens: at your command (when you start the upgrade process), the XTi shifts into a special mode in which it is no longer operating from its firmware but, rather, from a small piece of software called a bootstrap loader-a separate, protected software program that functions only at startup or when upgrading firmware. If you're computer savvy, you might wonder how your Digital Rebel XTi is able to overwrite its own operating system-that is, how can the existing firmware be used to load the new version on top of itself? It's a little like lifting yourself by reaching down and pulling up on your bootstraps.
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