Nutter, I think you may be somewhat confused about how the system works. 30,000 writes to an SD card takes a substantial amount of time. I think those writes you're talking about take place in RAM, and then are written once to the card. You can change the contents of a file almost indefinitely in RAM, but you don't have to write the whole database to a file each time. It's trivial to manipulate files in memory indefinitely, and only write to storage once when finished. That's the way almost every program works.