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Fix for 6420s (and possible 6430s) - Update with the proper card reader driver directly from Dell. LanDesk will sometimes take the card reader from newer laptop models
Correct driver for E6430s - http://www.dell.com/support/drivers/us/en/04/DriverDetails/Product/latitude-e6430?driverId=54WK9&osCode=W732&fileId=3215914513&languageCode=en&categoryId=CS