223j Diskstation, up to date. exFAT app removed when updating to 7.3.
Situations dictated shutting the NAS down a couple of times recently.
Each time get messages for the 4 USB drives
“not ejected properly. This may cause exFAT file system errors on partition USB Disk 1 Partition 1. Before you continue to use the drive, we recommend connecting it to Microsoft Windows or macOS to perform a restoration and ensure data consistency.”
They are all EXT4. Everything seems to work. 7.2 never did this.
It’s also not impossible to hose your data by just shutting down the NAS without properly ejecting the USB-attached drive(s) by clicking the eject button [].