External Casing+DvD burner giviing burning fail error ?

[multi]

alright 1st read my post carefully .

--------
I bought external casing with USB contact to my laptop for my AsuS DvD writer. I have attached it in external casing , power supply & all other things are okay. Pushing eject button -> drive is coming out & going in that also works fine .

now the real problem , I made an "Iso file " from best of Rajkapoor video files using imgburn . Output file is "Rajkapoor.iso"

I used imgburn , Alcohol 120 % & Nero but all of them failing , Nero showed message like "DMA Driver error"

while imgburn showed something else

Alcohol showing this kinda error

http://img267.imageshack.us/img267/9333/82752956vt5.jpg

used to these programmes while my Asus DvD writer was in Desktop & never gave any error but it stopped burning since when I fitted it in external casing

my OS is Win Xp so driver should be no problem (I hope )


wht is weired is that I checked my previous burned DvD (data & Video) both are reading fine in this external DvD

any sollution /suggestion ?

if this problem belongs to other section do move to whichever suitable.

[ax3]

delete this ISO file & try creating a new 1 ...... & c if u get this error again ....

or mayb cd/dvd is copy protected ......