Here is my problem: my mini-SD card used to work fine in my PN-820. I really don't use it very often though.

Some time ago I noticed that "\SD Card" folder (or whatever it was called) is no longer visible in File Explorer YET AT THE SAME TIME the icon on the top of the screen that indicates the card is inserted is visible.

Applications that rely on files copied on the card no longer work. Removing the card makes icon on the top of the screen disappear as expected. Inserting card back makes icon appear again but the "\SD Card" folder is not mounted. Only once after insertion SD card was visible for a short period of time but very soon disappeared again (I started application that reads files from the card, it hanged, I restarted my phone and the card was no longer visible).

Anyone had this situation before?