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Aporte original por: simone.crete ,


Try to do below fixes from your end:

1.    Try to plug in different drive or SD card and see if it appears in finder

2.    Check the file system format of your SD card.

3.    Repair your unreadable SD Card using Disk Utility built0in application First Aid

4.    If nothing works, try to recover your data from the SD card as you are left with no choice.