DVD-R Iincopatability?

I did finalize the discs, they are DVD-R. I also tried titling them with still no success, file explorer in Windows does not show or list them, they just won't read at all. Albert looks like you may have found the answer for me, as I feared that it may be a format difference and the only way around that would be to have them rerecorded (if that's even possible). Thank you all for the help and I can still give the data recovery program a shot too that might work so that I can get 'em to play on the TV.

OK, Jea48 Finalized disc did work because they play without a hitch on my deck. The deck is a combo of VHS & DVD LG model RC700N. Reading (the manual) the speed setting defaults to SP mode for recording, which I haven't changed, just that they won't play on others DVD players?

Yes, exercised the command to Finalize after each recording. It seems that the answer is that there is a conflict with the formats. I don't understand why the formats should be different for the makers of DVD-R, DVD-RW, I just want to be able to share these (for viewing purposes) with a friend of mine.

I did look at some of the specs for the LG players and found that it stated that they won't play on other units because the format is different! Now this sucks big time as I might or will have to search for another unit that will be compatible with what is so precious to me. I just thought that all the DVD layers had universal formats to play everything. Thank you everyone for your help and suggestions.

Thank you , I'll be getting back to you concerning this at a little bit later time.

OK, I have to look, I have been real busy today with a car show, I'll get back to you on that but I found in the specs for one of the new LG units that IT DOES say that the format is different, it may not say that in my manual but I'll check again and let you know.

Jea48 & Djohnson54, I have searched the manual and cannot find that it states there could be format differences. I did find that in the newer LG recorders though. I even thought that maybe the recording mode was wrong but, the manual says that DVD-R discs always default to Video mode and as such they (in theory) should play in others. That's why it baffles me as to why it won't play on my friend's earlier Sanyo or the newer RCA surround unit. I thought that maybe the format selection might be wrong and be in VR mode but, since the DVD-Rs default I can't be wrong so it only comes down to a format difference then as now stated in the newer models.