Thank you very much Mr.PIPO,
for the valuable explanation.

I wanted to know that if we give "file=exp.dmp and filesize=1GB" as you said ,

What I understand is that , the first file "exp.dmp" will be stored with only 1GB data.

and..after that What will be the second and third filenames....?

What is the sequence of filenaming...?

I am some what confused... pls. throw some light on it.

Thanks a lot.