Burns DVDs but only CDS on low speed

[MandE]

HELP!
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

[negritude]

Welcome to the forum.

What brand of CDs are you using?

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

Amazon.com: Allsop Ultra ProLens Cleaner for DVD, CD Drives, and Game Players (23321): Allsop: Home Audio & Theater

Make sure the firmware is up to date:

http://support.necam.com/Optical/ND3550A.asp