Sony VGN-AR31E User Manual page 67

To remove an ExpressCard module on VGN-AR series models
1 Push the ExpressCard module release button so that the release button pops out.
2 Push the ExpressCard module release button a second time so that the ExpressCard module pops out.
3 Gently take hold of the ExpressCard module and pull it out of the slot.
4 If the ExpressCard module release button is still out, push it back in all the way to the end.
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Using Your VAIO Computer