If the cover is opened while data recording is being executed, all open files are closed and access stops after the completion of active file access.
Once the access stops, the SD card access LED turns off, and the SD card can be removed.
As the data continues to be saved in the buffer memory of the CPU even after removing the SD card, pay attention to buffer overflow.
A file in the middle of logging when the cover was opened is saved as "%specified file name% (------current------).csv". Once the SD card is inserted again, writing into the file in the SD card restarts adding data to the "%specified file name% (------current------).csv".