Q: What does Format SD card?
A: it cleans-up the SD card, removing all data and internal error logging.
T: Before doing a SD card format, test the SD card, the outcome can tell you if card and Data Logger are healthy.
C: “SD card test” (Data Logger Manual)
T: Nice to know:
When the SD card is defect, the last measured data (the actual values) are sent to the configured output channel(s).
If the Data Log Interval is equal to the Data Send Interval, you do’nt even miss any data.