(question) File Server Migration ability ?

Hi, All

I started to migrate my 2003 File server to a new 2012 File server

I used the recommended scenario (RoboCopy) but because the current server is in another vLAN so it's very slow

My friend told me that I can attach the new storage to the current 2003 server and copy it, it'll be faster

now my question by copying it like this, shall the permission will be effected

(if I copied the data from one drive to another using this command robocopy /E //COPY:DATSOU /MIR /log+:C:\CopoReportLog.txt /xo /fft ) shall it get the right permission

Thanks