-=> Henri Derksen wrote to druck <=-

 > If this is happening the card needs to be replaced. If it wasn't a Zero
 > I'd suggest booting from a USB stick for better reliability, but as an
 > SD card is the only option, a high endurance version is probably
 > worthwhile.

 HD> I have seen a Pi starting form USB stick without a SD card
 HD> inserted. You then first need to write the write once only
 HD> OTP-bit in the machine. It then checks if there is an USB disk to
 HD> start from the Pi 3B. I am not sure if that OTP-bit is usable in
 HD> the older Pi's and Zero machines.

I have a Pi 3B running 24x7, with no SD card installed.  It boots 
and runs from a 2.5" laptop 500GB SATA hard drive, which sits in 
an externally powered adapter housing and connects to the Pi with 
a normal USB cable.  I did have to set the OTP-bit to enable that 
to work.  On a 3B+ it is not necessary to set the bit, it will 
boot from either an SD or an USB/external stick/drive.  This does
not work on any Pi 2's or earlier models.  I'm assuming the 4B 
will have this ability as well.


... So easy, a child could do it. Child sold separately.
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