I'm sorry but this post makes very little sense. What is it that you are actually asking??
When you have softmodded your Wii, you can install an external HDD drive that plugs into the USB port on the front of the Wii to read the games from there. of course, these would be image files of some description, and the HDD needs to be formatted in a particular way, but it should work non-the-less.
When you have finished softmodding, and you have your HDD installed and working, your SD card isn't required. It is however advisable to BACKUP your SD card so that you have the files/folders that you used to mod the Wii and also your NAND backup if you did one.
I do hope that I have helped, but I still do not clearly understand your post. What pics are you referring to when you say
dont see why i need to d/l the pics on the cpu and the wii