Hi,
I have problem with using micro SD card in my PocketBook 902. I have 2GB micro SD card, which I use in my Nokia 6303i phone.
I think, that it is standard to insert card into the slot and some lock holds the card in correct position. Pushing card releases lock and card can be removed. But not with PocketBook

There is no lock mechanism, so device can access card only when I hold card inside.