Many modern computers, phones and PDAs come with an expansion slot that supports secure digital (SD) cards. These are memory cards that allow you to store data, such as pictures, video clips and songs. If you have an SD card slot on your device, but it is not recognizing the card, there are measures you can take to troubleshoot and fix the problem.
Turn off the device and open the SD slot cover. On a laptop, this will likely be located on the side of the unit. On a phone it will be located on the side or bottom of the unit.
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Inspect the slot for any dirt or debris that may have accumulated inside. If there is any dirt or debris, clean it out with the end of a swab.
Inspect the slot for any metal connector terminals that may have become bent out of position and are sticking straight up. If there are any connectors sticking up, use the tip of a small screwdriver to press them back down.
Use a can of compressed air to spray in the slot to be sure all dust and dirt is removed from inside.
Try the SD card again. Make sure the contacts on the card are clean as well.