Sony VAIO VGN-CR100 Series User Manual page 56

Inserting a Memory Card
To insert a memory card
1 Locate the SD memory card slot.
2 Hold the memory card with the arrow facing upward and pointing toward the memory card slot.
3 Carefully slide the memory card into the slot until it clicks into place.
Do not force the card into the slot.
If the memory card does not go into the slot easily, remove it gently and verify you are inserting it in the proper direction.
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Using Your VAIO Computer