I got an email about a screen’s SD card failing. Why do some SD cards fail?

The most common reasons for SD cards to develop errors in a digital signage solution are:

  • Power fluctuations: Power fluctuations can very easily and quickly introduce small errors on an SD card. Poor power supply caused either by the bit you plug into the wall, also known as the Power Supply Unit (PSU), or poor wall sockets.
  • Turning the power on and off too often: We recommend that you leave your Screenly Raspberry Pi running at all times. Only turn off the television itself to save electricity. The Raspberry Pi uses very little electricity.
  • SD cards developed for infrequent use (like cheap camera cards): An SD card in a Screenly node is read from all day, every day, and it is written to quite often as well. “MLC” and “SLC” type SD cards are good for this purpose. If the card does not state what type it is, it is most likely the “TLC” type, which is best avoided.
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