Dead or Alive 2 Jap doesn't boot

[Mario Bros]

I downloaded dead or alive 2 jap CDI file. I made it with dj (mode1, cd-da, lall the games i made with these settings worked), but doa2 doesn't boot. it stops and give me the dreamcast option scrren (game,option,memory) What's wrong?

[Jay]

The jap version of dead or alive 2 is selfboot. Have u actually burned it as its native self boot or not?

[Mario Bros]

Problem solved.
The first time i burned it with 2048 blocks.Now I have just burned it with 2352 blocks and works fine. Why other games like Silent scope and crazy taxi work fine even if i burned it with 2048?