I have similar errors but i get an output:
sudo dosfsck -v -n /dev/sda1
dosfsck 2.11 (12 Mar 2005)
dosfsck 2.11, 12 Mar 2005, FAT32, LFN
Checking we can access the last sector of the filesystem
There are differences between boot sector and its backup.
Differences: (offset:original/backup)
430:4e/44, 431:54/61, 432:4c/74, 433:44/65, 434:52/6e, 435:20/74, 436:66/72
, 437:65/84, 438:68/67, 439:6c/65, 440:74/72, 441:ff/20, 442:0d/65
, 443:0a/6e, 444:4d/74, 445:65/66, 446:64/65, 447:69/72, 448:65/6e
, 449:6e/65, 450:66/6e, 451:65/ff, 452:68/0d, 453:6c/0a, 454:65/4d
, 455:72/65, 456:ff/64, 457:0d/69, 458:0a/65, 459:4e/6e, 460:65/66
, 461:75/65, 462:73/68, 463:74/6c, 464:61/65, 466:74/ff, 467:3a/0d
, 468:20/0a, 469:54/4e, 470:61/65, 471:73/75, 472:74/73, 473:65/74
, 474:20/61, 475:64/72, 476:72/74, 477:81/3a, 478:63/20, 479:6b/54
, 480:65/61, 481:6e/73, 482:0d/74, 483:0a/65, 484:00/20, 485:74/64
, 486:0d/72, 487:0a/81, 488:00/63, 489:00/6b, 490:00/65, 491:00/6e
, 492:00/0d, 493:00/0a, 506:ba/c4, 507:c9/d3
Not automatically fixing this.
Boot sector contents:
System ID "MSDOS5.0"
Media byte 0xf8 (hard disk)
512 bytes per logical sector
8192 bytes per cluster
38 reserved sectors
First FAT starts at byte 19456 (sector 38)
2 FATs, 32 bit entries
4887040 bytes per FAT (= 9545 sectors)
Root directory start at cluster 2 (arbitrary size)
Data area starts at byte 9793536 (sector 19128)
1221693 data clusters (10008109056 bytes)
63 sectors/track, 255 heads
63 hidden sectors
19566225 sectors total
Checking for unused clusters.
Checking free cluster summary.
/dev/sda1: 29449 files, 1001615/1221693 clusters
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Boot fs-check error - Differences between boot sector and back-up
https://bugs.launchpad.net/bugs/72293
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