The last couple of days I have been getting this warning and it is very annoying, as I can't use any apps from my SD card and it changes my ringtone so I don't recognize when my phone is ringing. I am unrooted, running froyo with the most recent (November) software update. I have also been getting the annoying "low on space" warning from time to time, which I've generally been able to remedy by clearing app caches as recommended on this forum. Does anyone know what's causing this and how to make it stop? I have loved this phone since I got it on release day, but this is annoying enough to make me want to switch phones. Edit: I have occasionally been able to get the phone to recognize the SD card by re-booting, but I just did that just now and about 5 minutes after I did it I got the warning again.