Would it be feasible to craft a single player, which would support both formats? What would be the issues (basic description). I read a lengthy article about blue laser technology a few years back. It really did not address the format issue in great detail. I also read an article about the differences in -RW, +RW, High density, etc. It mainly said the differences were where the data was being written to (land, groove, and both). Is this the same between the HD formats? I would appreciate a good reference source if someone knows one.