I got some new Sandisk 32gb Ultra sdcards installed Pi OS on them etc - but when booting the Pi they gave the error in the title - all the same.

  • Note that Sandisk Ultras are very commonplace (I have a stack of them I've used with pis, never any problem) so the correlation you are drawing here can't be correct or we would have seen this here before.
    – goldilocks
    Jan 14 at 15:04
  • @goldilocks I have used loads of them too... its just this last batch that are causing issues... out of the box, pi os imaged, boot in a Pi 3 and they fail.
    – pperrin
    Jan 14 at 18:56
  • I have ordered a new power supply... see if that helps...
    – pperrin
    Jan 18 at 17:36

2 Answers 2


The sd's come with some software installed by the manufacturer which the Pi OS install program doesn't/can't clear properly.

So just format the SD's before you start using the official 'SD Association SD Card Formatter' software from here https://www.sdcard.org/downloads/formatter/

Once the disk is properly formatted, then go ahead and install your OS etc...

  • This is unlikely as the Pi OS images overwrite any formatting -- it does not matter what is on the card to start with.
    – goldilocks
    Jan 14 at 14:45
  • @goldilocks this didn't fix it -- reformatting and reinstalling allowed it boot and finish the initial setup, but on a reboot it failed again. (I have four new cards... I have only redone two, as it is quite time consuming...)
    – pperrin
    Jan 14 at 18:58
  • @goldilocks this is normally true but the imager does not reformat the card so faulty blocks can remain. I have used the SD Association SD Card Formatter to resurrect failing cards (and hide the faulty blocks) although ultimately they need to be replaced.
    – Milliways
    Jan 14 at 21:43

I now believe these were fake cards. They ran for a bit then failed.

I got cards from another source and it is clear (for instance) that the printing on the card is better quality (less bleed, less grainy etc), so I am returning the duds for a refund.

I would probably delete the question - but there is a good tip on the SD Association Card Formatter hiding faulty blocks which is useful to know if you are having card issues!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.