I know there have been other posts about this but I feel I might have new information (but then again I haven't read every post). Like everyone else my phone will tell me that my SD card has been "unexpectedly removed". It happened before and I did temporarily fix it by backing up my data and reformatting it. What I noticed when I reformatted it was that it would go so far and then disappear again. This is when I had it out of my phone and in a card reader on my computer. Certain files made it disappear. I don't remember which ones did it but I think I just deleted it. Anyway, it's happening again. I was going to try defragging it just to see what would happen and every time it will stop at the same point and then disappear. If I don't choose to defrag it my computer is still able to read that it is there. After about the 5th time of trying to defrag it I decided I will just back it up again. It just keeps disappearing now when I try. I'm going to assume it's a certain file again and just backup each folder one by one and see if I can locate which file makes it disappear. If I can I will post what it is. Phone: HTC Incredible Micro SD: SanDisk Mobile Ultra 16GB Class 4 Edit: In the Android folder the com.google.android.apps.genie.geniewidget.news-content-cache folder and the com.google.android.apps.maps folder Edit: In the download folder the Amazon_Appstore-release.apk file Edit: a .png file in foursquare Edit: something in the folder rerware And that's it. I don't know if this helps. I know most people won't have what I have in my download folder but maybe it will help whoever figure out what's wrong. I guess those files are corrupted. I was able to eat all the folders except the folders in the Android folder so I'm going to reformat the whole card. Edit: I would have just changed "eat" to "delete" but I'm making cookies so I thought that little Freudian slip was funny.