what is the slot labled SC above the HD on my Latitude E6420

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In this quick video I'll add an SD card slot to two of my older laptops with a PC Card adapter

Inserting a SIM card of the wrong size could damage the SIM card or cause the SIM card to become stuck in the slot Smart card reader Supports optional I can conveniently insert my credit card into the SC slot on my HP EliteBook 840 laptop How can I utilize this when running Windows 10?

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