Hi,
I don't know. I haven't really used these DVD - R's and I'm not planning to! All the DVD - R's I bought so far are not playing good on my current DVD player. I am just going to try Verbatim or Ritek, best quality DVD - R's, and I recommend it to other people also!
kevin1488
If all you want to do is find the manufacturer of a particular disc; download an use the tool DVDIdenitfier. Its sole purpose is disc ID and it's simple to use.
Imation +R have been predominately manufactured by Ricoh. The Ricoh media are a good quality item.