Asus 5224A CDWRITER PROBLEM

Hi,
Forum Members,
These days I am facing a very very strange problem.I have so many multisession cds.Whenever I put some multisession cd in tray.It doesnt show remaining free space.I am using Nero V6 and I am using Windows XP SP2.The model no. of my writer is ASUS 5224A.Please Help me.
I need it very urgent.
Thank You
KompGeek