Sony VAIO VGN-CS - Manual (Page 55)

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