The is a controversial software utility often advertised to "double" or "expand" the storage capacity of USB flash drives and SD cards (e.g., turning an 8GB drive into 16GB).

Actually, look at the Capacity column. The SData Tool V100 often tricks Explorer into reporting a higher capacity. You may now see "32GB capacity" for a 16GB stick. The "Free Space" should now read roughly double what it was before the process.