Sony VGN-TZ340NCP - Manual (Page 51)

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Using Your VAIO Computer
Inserting an ExpressCard Module
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Use care when inserting or removing the ExpressCard module from the slot. Do not force it in or out of the slot.
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You do not need to shut down your computer before inserting or removing the ExpressCard module.
To insert an ExpressCard module
1 Locate the ExpressCard slot.
2 Carefully slide the ExpressCard module into the slot until it clicks into place.
Do not force it into the slot.