DC burning problems

Got a problem...

I downloaded "Sakura Taisen 4" for DC . Checking that the format is mdf and mds. So I used Alcohol to burn the game into a CD-R.

My settings is

write speed at 4x
RAW SAO(or is it DAO?) selected
Buffer Underrun tech. checked
" customize " selected

After burning . I loaded the game .. runs well until I get to the part where the characters have a conversation.. the text stops appearing and it takes a while for it to continue(not only that sometimes the background doesnt load so it ended up as a black screen)

As I progress thru the game..its gets worse as some events skipped and when one cutscene plays the game hangs ALOT... I recieved the final blow when the game showed a black screen and hanged. The VMU screen turned blank too.

Have I done something wrong? I really want to play this game. Thanks in advance.

Again this is an illegal post no COMMERCIAL SOFTWARE i should let you know that you have to READ the RULES before typing something so foolish anyways this will be locked