DLDI (Dynamically Linked Device Interface) files for Nintendo DS homebrew files that allow them to fully communicate with the flash cart device they are running on.
These are generally no longer needed as flash cart manufacturers commonly incorporate automatic DLDI patching in to the system firmware/loader.
@The Real Jdbye, I thought about that and I have blank DVD's and Blurays but honestly after like 90 songs I just listen to it a couple of hundred times toss it out and burn something else or have like 2-3 CD's. Florida here the heat in the car tends to ruin the CD's after like a few months even commercial pressed ones don't last too long.
Nowdays, my Samsung phone holds most my music on a 512gb micro sd. I Bluetooth to my earbuds, BT speaker, or to my car stereo from my phone. I still have a iPod Nano, but have not used in years.
It takes me 3 hours every week to cut my grass, and I have to have music playing, not to mention the noise canceling earbuds, so I don't have to hear that lawnmower noise. I do play iHeart radio often also when get board of my music.