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% sudo fsck_msdos disk4s1
** /dev/rdisk4s1
** Phase 1 - Preparing FAT
** Phase 2 - Checking Directories
** Phase 3 - Checking for Orphan Clusters
Free space in FSInfo block is unset (should be 4280)
Fix? [yn]

% sudo fsck.vfat /dev/disk4s1
fsck.fat 4.2 (2021-01-31)
Warning: Filesystem is FAT32 according to fat_length and fat32_length fields,
  but has only 31710 clusters, less than the required minimum of 65525.
  This may lead to problems on some systems.
Label in boot sector is 'Volume 0', but there is no volume label in root directory.
1) Remove label from boot sector
2) Copy label from boot sector to root directory
[12?q]?

% sudo gdisk /dev/disk4
GPT fdisk (gdisk) version 1.0.9

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): v

Problem: The secondary header's self-pointer indicates that it doesn't reside
at the end of the disk. If you've added a disk to a RAID array, use the 'e'
option on the experts' menu to adjust the secondary header's and partition
table's locations.


Warning: There is a gap between the main partition table (ending sector 33)
and the first usable sector (2048). This is helpful in some exotic configurations,
but is unusual. The util-linux fdisk program often creates disks like this.
Using 'j' on the experts' menu can adjust this gap.
Identified 1 problems!
Command (? for help):