Using the Application & Device control policy you can allow and block by Device ID
How to create a rule that will allow only specific USB’s on to your network.
http://www.symantec.com/business/support/index?pag...
This one (above) talks about how to block only specific USB devices.
Also, try this information , if that helps you.
How to Get an SD Card ID
# 1 Put your SD card into your media card slot on your computer. Use a USB media card reader if you do not have a media card slot.
# 2 Open the SD card in a window through "My Computer."
# 3 Select "Tools" and then "Folder Options." Click "View" and put a check mark by "Show hidden files and folders" and remove the mark by ""Hide protected operating system files." Before you can proceed, a warning will appear on the screen.
# 4 Click "Yes" then "Apply" and then "OK" to move past the warning screen.
# 5 Right-click on the "USBTRANS" file that you see on the screen. Select "Open" from the pop up menu to open a new screen. Then select "UNIT_ID" from the list of files on the screen and right-click on it. Select "Open with" and open the file with "Notepad."
# 6 Look down the file in "Notepad" until you see a line that starts with "SD Serial Number." Write down the first eight numbers in the SD serial number.
# 7 Re-write the number, separating the numbers into pairs. For example, if the number is 5224656B then you would write "52 24 65 6B." Put the number into reverse format to get the SD card ID. So, "52 24 65 6B" would be "6B652452." This final number is the SD card ID.