Nec2500 - media problem

Got some really cheap 4x dvdrs there, for my nec2500

_NEC DVD_RW ND-2500A 1.07
Current Profile: DVD-R

Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Supported Write Speeds: 2x, 4x, 6x, 8x

Pre-recorded Information:
Manufacturer ID: AN31

Above info was taken from dvd decrypter, Says the disc is not empty ??

The drive sorta clicks over and over until it sees the disc.

Problem is that nero sees the disc as been used (1mb) even though its empty, all the other discs work fine.

Is this a firmware issue ? or just bad discs or a bit of both, using herries latest DL firmware.

They were bought from svp.co.uk (infosmart)

Sounds like a bad disc to me.
AN31 is usually some pretty cheapo (poor quality) media.
Disc recognition problems and such are common with poor media.

getting them exchanged for other ones.