Thanks for the replies, I can assure you it has nothing to do with my system transfer rate as it always functioned perfectly on my 107D, I already checked UDMA settings and the IDE was set to DMA.
I can also say that I have solved this problem, I took the NEC back and had it replaced with a pioneer 110D, when I installed it the damn thing blew every disc out with a DMA driver error. I had a look in the box, one of my IDE leads was badly twisted so I straightened it out and put it back in, works perfectly now…doh!!! Never thought to check the IDE leads when I had the NEC in, probably would have sorted that.
I have also always had my DVD-ROM & DVD Writer on the same IDE channel, never had a problem with that setup and I have quite an old pc (about 4 yrold mobo and sdram ghehe), and as for G05 discs, well I have never had any issues with them so that is not an issue for me.
And yes, CloneCD will copy dvd’s but only if they are already copies, it will copy genuine dvd5 or dvd9 but you need AnyDVD running and the appropriate single or dual layer media, it does not compress anything.