I have a 6gb game iso file. iwant to burn it on 2 dvds that when game is installing automatically want 2nd dvd. is there any tricks plzzzzzzzzzz help me.

For this you will need to know the sequence in which the setup calls the files. Once you know the sequence just write first 4.7GB files in one disk and remaining files last in sequence in other.

While running setup it will pause in between insert second disk and click continue

NOTE: This does not work for all setups and might get error if the game needs play disk to run

Better way is to use file splitter (winrar works) to split the .iso file for writing in two DVDs and use virtual disk software (magic disk or Alcohol 120%) by keeping image on your hard disk
or
buy DVD 9 ( 8.54 GB)