BootMii and a couple other things were prime candidates for causing SD card issues. The guide as it has evolved has become less prone to this issue. That being said, a BootMii or wad issue generally point to SD card questions right off the bat. As with anything in life, this is a YMMV (Your Mileage May Vary) kind of thing.
We thank you for your input, but I suspect well-intentioned or not that's not what's really the point or issue. See the third sentence above.
Second edit: as an aside, why would you use or experiment with such small SD cards that aren't physically up to the task? You'd need 1gb SD at minimum to do the WHOLE guide, and to do it CORRECTLY. 4,000 consoles just points to 4,000 questions with a statement such as that. As a logical deduction, you must've felt a NAND backup was too bothersome a task.