mysql 5.1 data folder / directory / location

I've installed new MySQL 5.1 to replace my MySQL 5.0. I cannot find my data folder. 
Finally, check my.ini file in MySQL 5.1 folder and found line below


datadir="C:/Documents and Settings/All Users/Application Data/MySQL/MySQL Server 5.1/Data/"


All data folder is in "C:/Documents and Settings/All Users/Application Data/MySQL/MySQL Server 5.1/Data/"