here are situations which can cause the data lost. See below:
1.Accidentally deleted files from SD card
2.Formatted SD card
3.SD card got corrupted or inaccessible
4.Virus inflection
5.Power failure
Others
we have Renewandroid Android Recovery tool, which can recover photos and videos from SD cards on Android devices, also can recover contacts and messages on SIM cards. First of all, you need to download the program to your computer. Choose the right version for your computer. sd card data recovery