Try a completely different external case. Better still, try mounting inside a desktop to test the burner. My AD-7200A developed hanging/freezing problems with DVD playback and when I returned to the shop for warranty, the tech guy mounted it inside a desktop and it worked!!
I suspect that something minor did happen and for some strange reason, my AD-7200A demanded a better power supply. The original setup works now with a Pioneer DVD burner and the AD-7200A is in another case and is working fine in that combination.
Hope this helps. Good luck with your AD-7200A!!!
I have a AD-7200A which is installed in an external enclosure. The drive isn’t used very often.
Now I wanted to try a DVD-RAM on this unit and encountered several problems:
The disc isn’t always detected, sometimes it takes a very long time while the drive tries to detect the disc. If recognized, there are write errors, reported.
With DVD, the drive also has hard time to recognize the media.
I already opened the drive and cleaned the lens with Isopropanol. No improvement.
I can also rule out system related problems since other drives work fine, and the problems show up on my laptop (where I connected the drive to for troubleshooting), too.
CD recognition seems to be okay at the moment.
Any ideas? Must I prepare myself to bury the drive?