The best way to clear an SD card is to format it, which is like hitting a factory reset button; it'll erase every file, ...
SD and microSD cards are a de facto part of modern tech, especially for transferring large photo, video, and music files. Sometimes it’s necessary to format a card to clear room, or make it compatible ...
If the microSD card is unreadable through a peripheral device, the card may use an incompatible file system, such as NTFS, or it may not be formatted at all. Data corruption could also be the culprit.