Mio C520 - Manual (Page 22)

1.7 Inserting a SD/MMC Card
Your device has a SD/MMC slot where you can insert an optional Secure Digital
or MultiMediaCard storage card. It supports up to 2GB storage card.
To use a SD/MMC card, insert it into the slot, with the connector pointing to the
slot and its label facing the front of the device.
To remove a card, first make sure that no application is accessing the card, then
slightly push the top edge of the card to release it and pull it out of the slot.
NOTE:
Make sure that no foreign objects enter the slot.
Keep a SD or MMC card in a well-protected box to avoid dust and humidity when you are
not using it.
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