What is the recommended way to remove the SD card from ESP32S3 Think Plus?

Development Boards ESP32
1

Hello, if I just remove the card, disconnect the power source or unplug the cable connected to the computer while a program is writing data to it, will I corrupt the file or damage the card?

What is the recommended way?

2

It can corrupt them (similar to any other situation while writing to the card)

You can make removal safer by calling “SD.end” after writes; you could also flush after writes like so:

File dataFile = SD.open("/data.txt", FILE_WRITE);
dataFile.println(sensorReading);
dataFile.flush();  // Forces physical write (not just buffer)
dataFile.close();  // Always close files properly

You can also implement the SD card detect pin to trigger such

// Poll card detect pin or use a button sequence
if (digitalRead(CARD_DETECT_PIN) == HIGH) {
    SD.end();
    digitalWrite(STATUS_LED, HIGH); // Signal "safe to remove"
}
1 Like
3

Thanks. Is “SD card detect pin” a pin specifically for the SD card or just any physical switch connected to the pin is called “SD card detect pin”?