Some scans of two kinds of cheap Princo 4x dvd-r I burnt. iT SHOuld be noted that once I cleaned the lens with cotton and alcohol (which might have damaged the lens somewhat).
The first one: Princo 4x DVD-R I bought recently with shiny surface.
The 2nd: Princo 4x DVD-4 I recorded one year ago. The white label surface of the disc is different from the other, this has dull surface and it says "for data". This disk had intensive damage: I tried to bend it and I put it in dirty water. DVR-109 was not able to finish the scan: I stopped it because it was taking a lot of time (read errors)
I know I can't trust the 2nd DVD, but can I trust the first one?