La clé est bien sur /dev/sdc1 (mais ce matin, elle était installée sur /dev/sdb1) : ça commence par
yvou@yvou-K53SD:~$ sudo umount /dev/sdc1
[sudo] Mot de passe de yvou :
umount: /dev/sdc1: not mounted
yvou@yvou-K53SD:~$ sudo fsck.vfat -l -v -a -t /dev/sdc1
fsck.fat 3.0.28 (2015-05-16)
Checking we can access the last sector of the filesystem
0x41: Dirty bit is set. Fs was not properly unmounted and some data may be corrupt.
Automatically removing dirty bit.
Boot sector contents:
System ID "MSDOS5.0"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
16384 bytes per cluster
1024 reserved sectors
First FAT starts at byte 524288 (sector 1024)
2 FATs, 32 bit entries
1892352 bytes per FAT (= 3696 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 4308992 (sector 8416)
472399 data clusters (7739785216 bytes)
63 sectors/track, 128 heads
8064 hidden sectors
15125184 sectors total
Checking file /
Checking file /USB DISK
puis après vérification de chaque fichier,
Checking for bad clusters.
Reclaiming unconnected clusters.
Checking free cluster summary.
Performing changes.
/dev/sdc1: 377 files, 100180/472399 clusters
