When to Reformat the SD Card
It is important to reformat the SD card prior to each deployment to allow the Song Meter Micro 2 to make full use of the card's storage space. However, if you
wish to use your SD card to update the recorder's firmware1 or load a configuration file2, reformatting the SD card will also delete those files.
If you first format the SD card, then save a firmware file and/or configuration file to the SD card, you do not need to format the card a second time before your deployment. Formatting the card first ensures the firmware and configuration files are saved to the start of the SD card's storage space, with the remainder fully available for the Song Meter Micro 2's recordings.
Firmware files and configuration files are small enough that they will not meaningfully reduce your available recording space.