Nero Express Problem

I recently got a new CDRW drive, a LiteON 52X - this came bundled With Nero
Burning Rom/Nero Express 5.5.10.9. Im using Nero Express to archive all my
pictures from a digital camera, these are in dated folders. These would be
"multisession" discs, as files are added periodically

But i've noticed a problem when creating data CD's, i'm only getting maybe
250MB on a disc before it says it's full. This morning I started with a new
disc (Maxell 650MB) I copied 2 folders to it of 6 and 13 MB. But the
software says "Total Space Used": 57.6MB. Its the same with other
capacity/brands of disc, I tried a 700MB Imation CDR and the same still
happens. I never had this problem with my old drive - a Hewlett Packard

I've sent several emails to Nero technical support but had no response, does
anyone have any idea whats going wrong, and what I can do to correct it? Im
getting through a hell of a lot of discs.

Thanks in advance

Steven