Getting started with MM - ?

ember1205

Thanks. I have a Pi2 and Pi3, so I can use those. I also have some different cards that I can use for initial testing and such, but I’ll look for something a bit more “durable” in terms of the card itself.

Why would a card fail from a power-off? I could see file corruption, but straight up failure? And, since I don’t actually have adapters with a power button, my choices would only be a cord pull or graceful shutdown. The last time I was testing some functionality for a Pi, I ended up building a simple web system that allowed me to connect from any device and click/tap to initiate a shutdown. I could certainly go that route again if need be.

sdetweil

@ember1205 said in Getting started with MM - ?:

Why would a card fail from a power-off?

i don’t know… but I have 2, fairly new, (month) both 32 gig, differnt vendors, that are completely dead now… not accessible.

BD0G

Yup. What @sdetweil posted. They will fail catastrophically at some point if they are abruptly powered off too many times. Do I know why? No.

Dont worry there is a great module MMM-RemoteControl that allows one to access thier MagicMirror and perform a shutdown. This module allows any LAN/Internet connected device -phone, tablet, desktop, laptop to access a webpage that will display many functions that one can perform on the MagicMirror . Like turning a module on or off. Shutting down the mirror gracefully , etc.

ember1205

@BD0G

Thanks - I’ll keep that module in mind and be sure to load it.

I wonder if the card failure is the result of a disk write operation being in effect at the time of power-off and the level of corruption actually ends up causing the card to be converted into a permanent read-only device (with the corruption). I have seen a SSD drive fail like this, although I don’t believe that it had anything to do with powering off.

At any rate - I’m usually good about having things like this plugged into a UPS and shutting them down properly. :)

BD0G

@ember1205 I read somewhere that there is a utility to access the MicroSD card at a low level and potentially resurrect it. I did not dive to deeply into that as I have not had one fail and they are relatively inexpensive to replace.

I had a USB stick that was recognized at a severely diminished capacity than its actual listed capacity so thats what had me put my toe in to see if I could low level format it to the proper capacity.