iPod 4th generation or Photo hard drive replacement by micro SD card - iFixit Repair Guide
Classic IPods Are Super Upgradeable In 2022 | Hackaday
Is there any real advantage using SD over microSD? Looking forward for your thoughts!!! : r/ipod
MP3 Player, Music Player with 16GB Micro SD Card, Build-in Speaker/Photo/Video Play/FM Radio/Voice Recorder/E-Book Reader, Supports Up To 128GB - Walmart.com