04-19-2013 01:33 PM
If it is a v1 model, 2GB cards are the max (without 3rd-party firmware called Rockbox).
If it is a v2 model, the SDHC format is supported so you can use up to 32GB memory cards.
But just so you know, you really shouldn't be inserting a card with the player on. Always turn the player off, insert the card, then turn it back on.