OneDrive is Microsoft’s cloud service for sharing photos and documents. Recently Microsoft dropped support for FAT32 and now requires NTFS for hosting OneDrive local copies.
We noticed this with our HP Stream 7. We use a microSD card for supplemental storage and the default format for 32GB is FAT32.
If you need to change to NTFS with smaller 512 byte sectors, copy the card to a hard disk and reformat it and then copy the files back.
Microsoft is make more changes to the file system with the Fall Creators Edition when ReFS is expected to the begin to become available to the Professional edition. Eventually ReFS will become available to all users as development is completed.
Most users probably did not notice the change. Few use a microSD card for OneDrive.
QUICK & EASY CONVERT TO NTFS
Open up an elevated power shell and run
CONVERT F: /FS:NTFS /V
where F: is the drive letter for the FAT32 card. This will convert the file system and then the card can be put back into service with a Windows tablet.
The /V option is the verbose option which will show more of the progress as the device is converted.