Congratulations on discovering a solution that works for you.
Maybe take a look at this app (Fat Sorter 1.0.4 for Win PC) It works great for sorting the FAT after a file management session with your SanDisk player. This app really helps users who use Folder Mode. (Not necessary for Music Mode or Playlist Mode).
https://www.softpedia.com/get/System/File-Management/FAT-Sorter.shtml
