I did check the failed SD card using an USB card reader on a Rapsberry Pi. Below the results:
Any ideas of what may go wrong? (See system description via my signature)
pi@rasppi:~ $ ls -la /dev/sd*
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brw-rw---- 1 root disk 8, 0 Mar 13 16:38 /dev/sda
brw------- 1 root root 8, 1 Mar 13 16:38 /dev/sda1
brw------- 1 root root 8, 2 Mar 13 16:38 /dev/sda2
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fsck from util-linux 2.25.2
e2fsck 1.42.12 (29-Aug-2014)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/sda
The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem. If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
or
e2fsck -b 32768 <device>
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fsck from util-linux 2.25.2
fsck.fat 3.0.27 (2014-11-12)
/dev/sda1: 75 files, 2535/7673 clusters
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fsck from util-linux 2.25.2
e2fsck 1.42.12 (29-Aug-2014)
/dev/sda2: clean, 37241/455952 files, 287772/1929216 blocks