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root@cihonm:~ # dosfsck -avV /dev/sdb1
fsck.fat 4.1 (2017-01-24)
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 "mkfs.fat"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
32768 bytes per cluster
64 reserved sectors
First FAT starts at byte 32768 (sector 64)
2 FATs, 32 bit entries
8192000 bytes per FAT (= 16000 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 16416768 (sector 32064)
2047467 data clusters (67091398656 bytes)
32 sectors/track, 64 heads
2048 hidden sectors
131069952 sectors total
Starting check/repair pass.
Reclaiming unconnected clusters.
Checking free cluster summary.
Starting verification pass.
Checking for unused clusters.
Performing changes.
/dev/sdb1: 1085 files, 116565/2047467 clusters
1|root@cihonm:~ # fsck /dev/sdb1
fsck from util-linux 2.31.1
fsck.fat 4.1 (2017-01-24)
/dev/sdb1: 1085 files, 116565/2047467 clusters