You mean the microcard that comes with the Pono? Sure, from day one. However, it didn't automatically (at least for me) show up with the Pono software- you have to point to it the first time you try it. I got really tired of that software very quickly, I just mount the Pono (plug in the USB to the Pono and my iMac) and two mounted disks show up on the desktop. One is the internal Pono space (64gb) and one is the microcard (64gb). Then I just drag and drop music folders into either, clear off the Mac crud (Spotlight and two others) that is put on there using BlueHarvest (you can find a free program to do the same) and then unmount the disks. Unplug the Pono and it will scan the library. Done.
Unless you want to make playlists, there is no reason I can see to use the software from Pono. Others may feel differently.