If you’ve ever built a Pi for a kiosk, installation or information display, you’ll find Adafruit’s read-only Pi script invaluable. This script disables all the write-to-SD-card functions, meaning that you can pull the plug without any risk of data loss or corruption.
The Adafruit script forces Raspbian to store all its temporary data in memory, so no data stored on the SD card can be corrupted. This also means that nothing at all can be written to the SD card.
Adafruit Script puts Raspberry Pi in read-only mode
Script author, and Adafruit Creative Engineer, Phillip Burgess tells us, “We’re seeing Raspberry Pi really take off in situations where a microcontroller may have once sufficed,” and points out that less technical users are making things with a Raspberry Pi. Phillip wanted the ability to simply cut power like one does with an Arduino or a consumer product.
Phillip’s script includes ways to disable read-only mode, by use of a jumper or quick button connect
The script only works on Lite installations – “Stretch or Jessie should work,” Phillip tells us – and you can find the full instructions at Adafruit.