$ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 14.7 GiB, 15795748864 bytes, 30851072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

$ for i in {1..14}
> do
>     dd if=/dev/urandom bs=1M count=1000 of=$i
> done
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 70.6045 s, 14.9 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 70.467 s, 14.9 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 70.6904 s, 14.8 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 73.7669 s, 14.2 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 70.7134 s, 14.8 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 69.9391 s, 15.0 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 71.345 s, 14.7 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 70.3856 s, 14.9 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 71.5003 s, 14.7 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 68.5103 s, 15.3 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 67.9936 s, 15.4 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 68.5459 s, 15.3 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 68.746 s, 15.3 MB/s
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB, 1000 MiB) copied, 68.9829 s, 15.2 MB/s

$ sha256sum {1..14}
22842394bcfe90cb269215cf15e736cfdc1dd0baab496f81e8d6cdba4c39e44d  1
045b34116f5fa87216a0bb867420335b1781f56326eb104a227eb934c5099f8b  2
b1988a2f8d5a5e8521238904e87b719c02ba0b7b2d953bfd25d82034db1914f4  3
d6764231ff43655a7b9333de56c1c2dc87d8a25f40d8bc6dacb8656e83639006  4
f28a6db4525bde136225b9aabc9868a88ccd30a3bde47cf28fb3ffe625f40481  5
a7914ad94f2c0c1223fc9c614334ef9b6a83fe932358dcc699b9f63c00d6d119  6
862abb2e3ab46faa5a019fd9ac58366cfc655f9ff2046176241c742013708cad  7
bff7cd97eb73aade6a7d1c42f3bfc55abf23ee3780f6e5615bec095e7c019b2c  8
6e5c648cc49c3d704fe08b7b4c634747449fa76d16fd62b1a1375d95fe15ef01  9
d5aa6cbd1c23b00b42cada94cd69acc770c141f43ff75e8fed432226722b55a6  10
14228faa8eb1c421d4e02232a0d53050adea0741736f41aee2691700def12408  11
07e897482f78e04dbf4c82c857515ad8a9ab419bcbfdac7b5d63eda102d29529  12
df17d4d42ad8522070e2b7bb6637fb761361a3f83517d1905375fa053d036654  13
1c19630ab6085176807c1c01c230287955874856fb6e0939ec8d713cb64fb6f2  14

$ mkdir thumbDrive

$ sudo mount /dev/sdc1 thumbDrive

$ sudo chmod 777 thumbDrive

$ cp {1..14} thumbDrive/^C

$ sudo umount thumbDrive/

## Had to unmount the partition, disconnect the thumb drive, pack up my laptop, and leave after the first 7 files were fully written (waited just til the 7th file was completed.)

## Partition got auto-mounted, that's why its in a different location.

## Deleting partially written file.
$ rm /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/8

$ cp {8..14} /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/
cp: error writing '/media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/14': No space left on device

## Partition ran out of space due to 5% of the storage space being reserved for root, by default. Changing this, deleting partially written file, and copying the last file over.

$ sudo umount /dev/sdc1

$ sudo tune2fs -m 0 /dev/sdc1
tune2fs 1.42.13 (17-May-2015)
Setting reserved blocks percentage to 0% (0 blocks)

$ sudo mount /dev/sdc1 thumbDrive

$ cp 14 thumbDrive

## Unmounting the partition, removing the thumb drive, and reconnecting it to make sure my OS doesn't have data which should be on the thumb drive cached. Remember that it gets auto-mounted due to being reconnected, so the path changes, again.

$ sudo umount /dev/sdc1

$ sha256sum /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/*
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/1: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/10: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/11: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/12: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/13: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/14: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/2: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/3: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/4: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/5: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/6: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/7: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/8: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/9: Input/output error
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/lost+found: Permission denied

## Weird. Let's try again.

$ sha256sum /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/*
7a0dd528a155561f264dde079a8f5cbbd2ed286a00c7a9a78d2c719f61f77229  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/1
d5aa6cbd1c23b00b42cada94cd69acc770c141f43ff75e8fed432226722b55a6  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/10
14228faa8eb1c421d4e02232a0d53050adea0741736f41aee2691700def12408  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/11
07e897482f78e04dbf4c82c857515ad8a9ab419bcbfdac7b5d63eda102d29529  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/12
df17d4d42ad8522070e2b7bb6637fb761361a3f83517d1905375fa053d036654  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/13
1c19630ab6085176807c1c01c230287955874856fb6e0939ec8d713cb64fb6f2  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/14
045b34116f5fa87216a0bb867420335b1781f56326eb104a227eb934c5099f8b  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/2
b1988a2f8d5a5e8521238904e87b719c02ba0b7b2d953bfd25d82034db1914f4  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/3
d6764231ff43655a7b9333de56c1c2dc87d8a25f40d8bc6dacb8656e83639006  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/4
f28a6db4525bde136225b9aabc9868a88ccd30a3bde47cf28fb3ffe625f40481  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/5
a7914ad94f2c0c1223fc9c614334ef9b6a83fe932358dcc699b9f63c00d6d119  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/6
862abb2e3ab46faa5a019fd9ac58366cfc655f9ff2046176241c742013708cad  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/7
bff7cd97eb73aade6a7d1c42f3bfc55abf23ee3780f6e5615bec095e7c019b2c  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/8
6e5c648cc49c3d704fe08b7b4c634747449fa76d16fd62b1a1375d95fe15ef01  /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/9
sha256sum: /media/christoph/e5751a98-025e-4817-b1b6-808902e67ea6/lost+found: Permission denied

------------------------------------------------------------------------

So it failed for these files:	1
And it succeeded for these:   	2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

It therefore is not a fake thumb drive which states to have more storage space than it actually has.

Q.E.D.