Sony VGN-SZ3HP/B User Manual page 51

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Using Your VAIO Computer
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Insert the ExpressCard slot protector to protect against debris entering the slot when not using an ExpressCard module. Before moving your computer,
make sure to insert the ExpressCard slot protector into the slot.
If the module or adapter does not go into the slot easily, remove it gently and verify you are inserting it in the proper direction.
Make sure you use the most recent software driver provided by the ExpressCard module manufacturer.