Optimizing Linux filesystems for cheap flash drives

It's not, see the discussion about. I think we can do much better than FAT as well, even given the characteristics of the current drives. Ted Ts'o has some ideas for ext4, and my understanding of btrfs is that it does not rely on a specific block allocation at all, so that could be an excellent target as well.

Starting out a completely new file system designed only for SD cards would of course make it possible to get the best result, but that would also be an enormous amount of work.