ACHTUNG - Additional drives and their order of preference

[amethyst]

Up and to the "older" FossaPup, the two most common additional drives ie. the adrv and ydrv were available with the adrv having preference over the ydrv. I haven't used any other Puppys newer than Bionic so need some information here about existing newer Puppys. Which addiditional drives are available and what is the order of preference of these additional drives in terms of AUFS? And what is the situation regarding this when it comes to overlays.