Batch files - nested loop

Help to writ batch file script!!!!!!!!! I want a script that lokkink for free space on the hard disk: I wrote the following: @setlocal enableextensions enabledelayedexpansion @echo off set gbsize = 1,073,741,824 Set gbsize=%gbsize:,=% for %%A in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do for /f "tokens=3" %%a in ('dir c:\') do ( set bytesfree=%%a ) set bytesfree=%bytesfree:,=% echo %bytesfree% endlocal && set bytesfree=%bytesfree% but it doesnt work, I allways get sytax erro, can you help please?