Burns DVDs but only CDS on low speed

My NEC ND-3550A has started giving Medium error 03 message when recording CDs unless I drop the writing speed to 8. No trouble with DVDS I use Roxio 7.5

Welcome to the forum. :flower:

What brand of CDs are you using?

Have you tried cleaning the drive with a cleaning disc, like this one:

Make sure the firmware is up to date: