1. $ dmesg | tail
  2.  
  3. [ 6032.900794] mmc0: cannot verify signal voltage switch
  4. [ 6033.117679] mmc0: cannot verify signal voltage switch
  5. [ 6033.510015] mmc0: Skipping voltage switch
  6. [ 6033.636511] mmc0: new high speed SDHC card at address e624
  7. [ 6033.641068] mmcblk0: mmc0:e624 SD16G 14.8 GiB
  8. [ 6043.648785]  mmcblk0: unknown partition table
  9. [ 6059.042448] Initializing Realtek PCIE storage driver...
  10. [ 7026.218017] EXT4-fs (mmcblk0): VFS: Can't find ext4 filesystem
  11. [ 7036.226508] EXT4-fs (mmcblk0): VFS: Can't find ext4 filesystem
  12. [ 7046.235013] EXT4-fs (mmcblk0): VFS: Can't find ext4 filesystem
  13.  
  14. Then, tried to mount /dev/mmcblk0 with -t msdos:
  15. [ 9234.683416] FAT-fs (mmcblk0): invalid media value (0x00)
  16. [ 9234.683425] FAT-fs (mmcblk0): Can't find a valid FAT filesystem
  17. [ 9417.752448] mmc0: card e624 removed
  18.  
  19. ---
  20. Same error with other SDCard:
  21. [ 2990.335265] mmc0: new high speed SDHC card at address b368
  22. [ 2990.335551] mmcblk0: mmc0:b368 SU04G 3.74 GiB (ro)
  23. [ 2990.336474]  mmcblk0: unknown partition table