My akira DVR-M6160HDD now can't seems to play a DVD and a DVD that I have record previously before and keeps displaying No Disc error when I loaded it. However it is able to play VCD. The DVD I have inserted is Code 3 and when I play it on my pc, it works but not on this recorder.
A few months back, I have tried to play a DVD-R which I have used to record a show on and it is able to play.
Generally, you'll want to use reputable blank media. I use only made-in-Japan discs which are usually not available in stores and can only be purchased online.