cd writer keeps getting errors

Hey there

I have just got a Aopen CRW9624 and I tried backup some data for the first time and I keep getting errors of –

I/O error Buffer underun – Easy CD Creator ran out of data while recording a track because data could not be provided tothe CD-Recorder fast enough and Track write error

I have switch to a lower speed of 1x, 2x and it same thing happens

My cdr was set at secondary master but now i have switch it with my cd rom and now set as primary slave the same chain as my hdd.

The software i am using is NTI-CD software which came with the writer and now trying out Adaptec easy cd v4. all same errors

I am using verbatim cd’s

Please advice

Thanks in advance
J Chew