FSCK für Loop Device

root@ofen:/# fsck /dev/loop0
fsck from util-linux 2.36.1
fsck.fat 4.2 (2021-01-31)
FATs differ but appear to be intact.
1) Use first FAT
2) Use second FAT
[12?q]? 1
Free cluster summary wrong (521468 vs. really 517407)
1) Correct
2) Don't correct
[12?q]? 1

*** Filesystem was changed ***
The changes have not yet been written, you can still choose to leave the
filesystem unmodified:
1) Write changes
2) Leave filesystem unchanged
[12?q]? 1
/dev/loop0: 31 files, 4065/521472 clusters