New wd tv live

i just bought a new wd tv live and i am trying to assign a drive letter and it keeps asking me for a password i have another one that is a wd tv live media hub and i do not remember the password for wd discovery to configure what can i do

Hello, are you trying to map a USB hard drive connected to the WDTV? If yes, try mapping it manually. 

Create a shortcut to (map) a network drive

http://windows.microsoft.com/en-us/windows/create-shortcut-map-network-drive#1TC=windows-7