Copying Drive/Directory w/ minimal overhead

@echo off
rem Main use to move entire directory/drive without looking at the data before hand or otherwise reading the data more then needed.
rem useful for larger drives/folder sizes with many files.
rem respects access rights (if you can not get there in command-line, or access/read they file it will skip it)
rem meant to be as light as possible for drives that may not tolerate a lot of data manipulation.
rem Powershell version in the works, for network access.
rem must be local drive w/ letter or mapped network drive that is accessible via mapped drive letter.
rem use of the variable adjustment to avoid multiple inputs that can be referred from a path&Drive letter.

rem setting variables, and tests for arguments being passed in or not, & checks \? for help
set FILENAME=DC.bat
if %1 == \? GOTO HELP
set SRC=.
set DEST=.
set SRC=%1
set DEST=%2
set INP=.
set IFL=.
set IFLP=.
if %SRC% == . GOTO NSRC
if %DEST% == . GOTO NDEST
GOTO FORM

rem Starting loop, moving to the correct drive, then moves to the right folder (with assuming it may not always be the root of the drive.
:START
%SRC:~0,2%
cd %SRC%
for /r %%a in (*.*) do (
set INP=%DEST%%%~pa
set IFL=%%a
set IFLP=%%~nxa
CALL :ACT
)
GOTO FIN

rem Checks for the matching folder structure, and does it one level at a time, due to the nature of the recursive For loop that calls [ACT], then creates the folder if needed which is followed by a copy.
:ACT
IF NOT EXIST "%INP%" MD "%INP%"
copy /v /y "%IFL%" "%INP%"
IF EXIST "%INP%%IFLP%" echo "%INP%%IFLP%"
GOTO FIN

rem some input cleaning and ensuring that the variables can mesh the paths as needed without error.
:FORM
IF %SRC:~-1% == / set SRC=%SRC:~0,-1%\
IF NOT %SRC:~-1% == \ set SRC=%SRC%\
IF %DEST:~-1% == / set DEST=%DEST:~0,-1%
IF %DEST:~-1% == \ set DEST=%DEST:~0,-1%
GOTO PRIME

rem Argument checks
:PRIME
IF NOT EXIST "%SRC%" GOTO NOSRC
IF NOT EXIST "%DEST%" GOTO NODEST
GOTO START

rem error outputs, and pauses in the following sections, and the help section bellow.
:NSRC
echo Source Input required at end.
pause
GOTO FIN
:NDEST
echo Destination Input Required.
pause
GOTO FIN
:NOSRC
echo Source Directory does not exist, or incorectly entered
pause
GOTO FIN
:NODEST
echo Destination Directory does not Exist, or incorrectly entered
pause
GOTO FIN
:HELP
echo For copying entire Directories with folder structure intact, ignoring 'empty folders'
echo %FILENAME% [Source] [Destination]
echo Example %FILENAME% X:\ "F:\Named Folder"
echo If folders have spaces in the name. use Double Quotes around the whole argument Example "D:\Named Folder"
:FIN