Hi everyone, I have a SanDisk microSD card that I’ve been using in my camera, phone, and GoPro. Suddenly, I can’t write anything to it anymore. This is really driving me crazy.
I can view and copy files from the card, but I can’t delete anything or format it—Windows says the disk is write-protected, so I can’t add new files or save anything. When I try to format it, the process either fails immediately or gets stuck. The card is visible in File Explorer and Disk Management, but all options are grayed out and unavailable. I’ve tried this on multiple computers and devices—the same problem occurs everywhere.
If all else fails, formatting is your last resort. This is a last resort; there are other options, such as using command-line tools. Check out these tips.
https://forums.sandisk.com/t/why-is-my-sandisk-card-write-protected-and-how-do-i-remove-it/247759
Perform a low-level format using the SD Card Association’s official SD Memory Card Formatter tool. If this fails, it indicates hardware damage, and you will need to replace the card.
This means your microSD card has entered a read-only failure mode. It’s not a Windows issue. The card’s internal controller locks writing when it detects damage or wear, which is why you can read files but can’t delete, format, or save anything on any device.
First, back up all your data immediately while it’s still accessible. If some files are missing or corrupted, you can try a tool like Stellar Photo Recovery.
Realistically, it’s not fixable. Once a card goes into this read-only state due to wear or internal errors, it’s basically done. No formatting tool or command will bring it back to normal use.
