And if you take a card from a scanner and load it in a computer's card reader, you can even do full database updates and more importantly, any firmware updates. If it's a rare firmware update situation, when you do the f/w update then put the card back in the scanner, the latest firmware is loaded. Follow instructions on scanner how to finish it up.
The ability to update a scanner by taking the SD card out and using a computer card reader is very helpful for scanners mounted in vehicles, etc. and getting a computer to them is a pain.