You may lose important files on an SD card due to various reasons, while SD card blank and has unsupported filesystem is one possible reason. Here is a case about SD card unsupported file system:
"I have an SD card for my Android phone. There are lots of precious pictures and videos on the SD card, but the phone says that SD card is blank and has unsupported file system. I cannot access the card. Connecting the SD card to my computer, Windows system also reports the similar message to say that SD card is blank and has unsupported file system. How can I get back photos and videos from SD card when it is not accessible?"
Although SD card is showing blank, files are still stored on the card. At this time, you should stop performing any operation on the SD card; especially you had better not write any new data to the SD card. What you should do is to run a data recovery program to extract files off the SD card. You can rely on iCare Data Recovery software for SD card recovery when it shows blank and has unsupported file system. This data recovery software enables you to recover pictures, videos, music, etc from any brand of SD card including SanDisk, Samsung, Lexar, Transcend, Kingston, Toshiba and more.
Free download best software recover deleted files from SD card that shows blank or has unsupported file system:
Step1. Attach the SD card to computer via a card reader or USB cable. Then, free download and install iCare Data Recovery software on the computer. Double click the software to open it and choose a recovery module.
Step2. Choose the SD card and then wait patiently until it shows all lost files.
Step3. Preview pictures or documents when you see all files in the list and then select the files to restore.
SD card is blank or has unsupported file system on Android phone, camera or computer? When you attempt to access the memory card, it may ask you to format the SD card. Can you format SD card when it shows blank and requires formatting? If there is no important data on the SD card, you can format it to fix the problem. However, if you still have important data on the card, you had better not format it. Instead, you can run the data recovery software to rescue the files you need. You can format the SD card when all data has been restored successfully.
If pen drive shows 0 byte and asks formatting, you can also use the same method to restore data and repair the error.
Usually, when you receive message that SD card is blank or has unsupported file system, you may find that its file system has changed to RAW. Android phone, digital camera and Windows system cannot recognize RAW file system, so it usually detects the SD card as a blank card when it turns to RAW file system. In this situation, system will ask you to format SD card so that you can convert its file system from RAW to FAT32. Usually, you can format the SD card in digital camera, Android phone or computer when you have recovered all files you need.
Usually, when SD card shows blank and asks to be reformatted, it is strongly recommended you not to format before getting back lost files. However, if you mistakenly reformat SD card before data recovery, the important thing you should remember is not to write any new data to the formatted SD card. As long as the original has not been overwritten by new added data, you still have chance to recover photos / data after formatting SD card by accident.
How to fix micro SD card blank or has unsupported file system error? You can also follow the guide above to resolve the problem on micro SD card.
CF card has some difference from SD card, but you might meet the similar problem on a CF card and cannot read data on the card. If CF card is not detected by PC, you can also rely on iCare Data Recovery software to get back files.