Depending on your head unit, you will need either SD card or USB drive to install the map & software update.  

You will receive either SD card or USB drive when you order the map & software update from

If you are planning to download the map & software update, please follow the media type requested by the Navigation Updater software.

SD card: max size 32 GB (do not use micro SD card)
USB drive: max size 64 GB

Please remove all files from your existing media before copying/downloading* files for the map & software update.

* Navigation Updater will format your media prior the download process.

An exception for 2015 Hyundai Genesis JogDial, this vehicle head unit require both SD card and USB drive to start the update process. Please follow this link for detail instruction.