It’s possible for a perfectly working SD card to fail without warning, but most SD cards first show certain tell-tale signs of corruption/damage before they stop working.
Common Signs Indicating SD Card Corruption/Damage
Nothing Worked? Use SD Card Data Recovery Center to Restore Lost Files Use the Diskpart Command in CMD (without Formatting) Fix SD Card by Formatting a RAW SD card to FAT32 Fix SD Card/USB Drive Using Windows Repair Tool Use SD Card Data Recovery Software to Recover Files Fix a Card by Trying CHKDSK Command to Check for Memory Card Errors Try Another USB Port or Change Adapter/Card Reader Common Signs Indicating SD Card Corruption/Damage.