$  dmesg |tail
[  317.267301] mmc0: error -110 whilst initialising SD card
[  317.351864] mmc0: error -110 whilst initialising SD card
[  318.433986] mmc0: error -110 whilst initialising SD card
[  318.488773] mmc0: error -110 whilst initialising SD card
[  318.550771] mmc0: error -110 whilst initialising SD card
[  318.633498] mmc0: error -110 whilst initialising SD card
[  319.714137] mmc0: error -110 whilst initialising SD card
[  319.768940] mmc0: error -110 whilst initialising SD card
[  319.830929] mmc0: error -110 whilst initialising SD card
[  319.913665] mmc0: error -110 whilst initialising SD card

===============================================================================

$  dmesg |tail
[  319.830929] mmc0: error -110 whilst initialising SD card
[  319.913665] mmc0: error -110 whilst initialising SD card
[  396.880769] audit: type=1006 audit(1550221864.709:37): pid=398 uid=0 old-auid=4294967295 auid=1000 tty=ttyS2 old-ses=4294967295 ses=4 res=1
[  407.312324] mmc0: new high speed SDHC card at address 0007
[  407.320489] mmcblk0: mmc0:0007 SD16G 14.4 GiB
[  407.327138]  mmcblk0: p1 p2 p3
[  448.303193] mmc0: card 0007 removed
[  450.867917] mmc0: new high speed SDHC card at address 0007
[  450.874731] mmcblk0: mmc0:0007 SD16G 14.4 GiB
[  450.880888]  mmcblk0: p1 p2 p3

===============================================================================

$ ls /mnt/
bin   dev  home  lost+found  opt   root  sbin  sys  usr
boot  etc  lib   mnt         proc  run   srv   tmp  var
$ sudo touch /mnt/test
$ ls /mnt/
bin   dev  home  lost+found  opt   root  sbin  sys   tmp  var
boot  etc  lib   mnt         proc  run   srv   test  usr
$ dmesg |tail
[  319.913665] mmc0: error -110 whilst initialising SD card
[  396.880769] audit: type=1006 audit(1550221864.709:37): pid=398 uid=0 old-auid=4294967295 auid=1000 tty=ttyS2 old-ses=4294967295 ses=4 res=1
[  407.312324] mmc0: new high speed SDHC card at address 0007
[  407.320489] mmcblk0: mmc0:0007 SD16G 14.4 GiB
[  407.327138]  mmcblk0: p1 p2 p3
[  448.303193] mmc0: card 0007 removed
[  450.867917] mmc0: new high speed SDHC card at address 0007
[  450.874731] mmcblk0: mmc0:0007 SD16G 14.4 GiB
[  450.880888]  mmcblk0: p1 p2 p3
[  507.143226] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
