Thank you for bringing this issue to our attention. To help other perspective customers further,we will explain this issue in detail.
Generally speaking, in rare cases, old SD card which has never been reformatted before might became unreadable if you remove the memory card while the device is reading( flashing blue light on). Because apple iOS system only recognise photos on FAT32 file system. Some old SD card might be FAT16 file system as factory setting. Thus, iPad try to put files in correct settings and hence the issue could arise(Once initialising SD card as FAT 32 file system on PC, this issue will never happen again).
We strongly recommend perspective customers should back up all your photos and format SD card on PC or camera before using our card reader first time. Please feel free to contact us at email@example.com if you need further assistance.
Your KiwiBird Amazon Team