DVD-R Iincopatability?

I have an LG unit that I can record on and we tried watching the DVD-Rs on a friends Sanyo and also RCA units but, they don't load and play.

A stand alone LG DVD-R recorder box unit. Model Number?

I did finalize the discs
08-06-15: Rsjm80

But was it successful? If the FINALIZE was successful on the front display panel of the LG DVD recorder it will no longer read, display, DVD-R, it will read, display, DVD.

Also Djohnson54 brings up a good point on what speed did you use to record the DVD? Not all DVD players can read DVD-R discs. Especially if they were not recorded using the SP or LP mode setting on the DVD recorder.
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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?

If you can now just rip the files somehow, your problem will be solved. Since you're already using Windows, download a free program called MakeMKV. I really don't like to use Windows for stuff like this, but this is pretty straight forward now that we know what you are dealing with.

So, if you can, try MakeMKV and I'm pretty sure you'll be able get your files into a state where you can use them as you wish. Even if it doesn't work, there are other programs you can try, but the one I listed is the easiest.

Finalized disc did work because they play without a hitch on my deck. The deck is a combo of VHS & DVD LG model RC700N.
08-06-15: Rsjm80

Rsjm80,

The disc does have to be "FINALIZED" to play back on DVD recorder it was made on. Did you check when you load the disc/s in the LG recorder if the front display panel says DVD or does it still say DVD-R? If it says DVD-R the disc/s is not finalized. The recorder does not automatically finalize the disc. The user has to command the recorder to finalize the DVD-R disc.
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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.