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What's the memory-capacity of the card?
Is it a larger amount of storage than the maximum size supported by the MP3 player?
Not all memory-cards run at the same "speed" -- the player may require a "faster" memory-card than your memory-card.
Check your memory card properties,see if your memory card is really 4 gig.Also check the free space and the used space capacity..Try to insert your memory card to other device to make sure your memory card is working..Hope this may help you.
Even though your player gas a capacity .is 2mb.The actual memory which you can use is around 70 to 80% .Because rest of the space is used to store protected system and boot data.The same happen in every memory device, be it a thumbdrive , memory card etc