My suggestion for getting SD card support is using a USB adapter. I'm using a Sandisk one [0]. It's quite small and hardly sticking out at all, and I just have

My suggestion for getting SD card support is using a USB adapter. I'm using a Sandisk one [0]. It's quite small and hardly sticking out at all, and I just have it plugged in to the radio permanently. Otherwise, my Pioneer DEH-X6650BT let's you switch between directories with a button press. Basically you have previous and next track, as well as previous and next directory. The toplevel is simply another directory. It also remembers where it left off after you start it, and it is super snappy with 19GB of MP3s that I have in various directories. Also, the manual is very explicit on what file system is supported, how many files and directories and in which order files are being played. See this page and the next one [1]. The only downside is that I can't seem to turn it off. As in it the radio is always illuminated, even when you are not playing anything. [0] SanDisk MobileMate USB 3.0 Reader https://shop.westerndigital.com/en-au/products/accessories/sandisk-mobilemate-uhs-i-usb-3-0-microsd-reader-writer#SDDR-B531-GN6NN https://shop.westerndigital.com/en-au/products/accessories/s... [1] https://www.manualslib.com/manual/730613/Pioneer-Deh-X6650bt.html?page=20#manual https://www.manualslib.com/manual/730613/Pioneer-Deh-X6650bt...