This is just to confirm that it is possible to get a 128Gb micro SD card work with a 8Gb Sansa Clip+ … I reformatted the new card as FAT32, and my Clip+ was running Rockbox. It gives a formatted size of 119 Gb. The formatting was very fast, and it worked first time. No appreciable slowing down compared with the 64Gb micro SD card I used previously. The only “drawback” was waiting for 111Gb of data to copy across from my laptop to the new SD card - having already selected the files I wanted (an even more time consuming task!).
I guess I will probably upgrade to a 256Gb microSD card when one is available (and no longer expensive), but I can’t at the moment imagine needing more space on an mp3 player. The 128gb card meets my need.
The Clip+ has to be the best mp3 player in the world by a wide - wide margin.