A PSP game couldn't be found on the disc

[[Unknown]]

Another thing you could try is plugging the card back into the laptop - if the files are still missing there (or other devices), then it pretty much confirms the SD card is rubbish.

If it works everywhere else, it could mean there's something wrong with your phone's SD card port. But it's far more likely you got a ripoff SD card, as LunaMoo said. You have to be careful when buying cheap ones - as they say, there's no such thing as a free lunch.

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