Hi, I need to remind you one thing which is very important is that after you meet the situation you've met, don't use your Kindle. OK? If you keep using it, you may cause the data overwritten situation and once this situation happens, you may lose the chance of getting back your files. Now, I will explain why the data overwritten situation will make you fail to recover your files and the possibility of lost file recovery process. First thing first, the data overwritten. In a simple way to explain this to you. You have a file which name "File A" on your flash drive. When you delete it or format your flash drive, the system will not really delete it. The system only frees up the space which was belonging to "File A" so that this space can be used by other new files you may put into this flash drive later. At this moment, you still have chance to recover your files. If you put a new file which is named "File B" into this drive, the "File B" will take the space of "File A", this is the so-called data...

I agree with Tom's idea and I think it is the motherboard problem. But be careful when you move your drive to another device, I do hope you only meet hardware problem but not data loss problem. If you meet data loss problem, see if this post help you or not

Hi Shelly. Don't panic once you find that the photo loss happened. The first thing I hope you can do is to stop using the device to avoid the data overwritten situation. Actually the delete command or formatting will not really delete the files in your device. All the commands do is only to free up the space of the deleted files so that the space can be used by the new files. If you keep operating on your device, you may make some new files which will take the space of the deleted files and you will lose the chances to recover the deleted files. To help you to solve your problems, you need to make your son's Nintendo DSi as a USB drive or external drive which can be read by the computer and then search methods to recover the files. You can check more details in this post to get more helpful tips you may need: http://www.uflysoft.com/data-recovery-mac/how-to-recover-data-from-usb.html