Yeah... no. It doesn't do that at all. What it does is realign them on the FAT (File Allocation Table) in alphabetical order. By default, the table records them by the order in which they were copied to the volume (in this case, the MicroSD card's FAT32/XFAT partition) and not alphabetically. As Gateway uses the FAT to build the display order, the order in which they are copied to the volume is the order that is shown. By resorting them with FAT Sorter, you're effectively changing the order of the entries for each file, which makes them sorted for the Gateway to read in your desired order. As a result, though you're not re-writing the files themselves, you are technically rewriting the FAT, but it's only once each time, and the FAT is too small to be worth worrying about in regard to life degradation of the MicroSD card.