iMac Lion will not play burned dvd-r's that already have files on them, any idea how to fix this?

I am in the same boat...burned a miniDV to DVD with a converter that I have used to burn over 100 tapes to DVD...made a copy with a converter on my mac all was fine...then did a software update, played the DVD on our DVD player for my daughter, came back to make more copies and it thinks the DVD-R is blank. I put it in my old PowerBook and it sees it fine! Any fixes??? please oh please...my PowerBook is too slow to always use for copies!

I'm wondering if anyone else has tried my suggestion of booting into 32bit mode. This allowed me to see the data on the disc.

This worked for me.

I was wondering if it worked for anyone else?

I have been using Macs since 1992, upgrading to new operating systems as they came out. Now have Lion 10.7.3

I have recorded video/movie clips mostly from online sources. I have never had problems playing these back until now. Some will play, others when I click the play button come up with the message "supported disc not available". I have read the comments on this thread, but am not very cluey about rebooting and other technical stuff. Do I have to rescue one of my old Mac computers with earlier OSX operating systems to play these again? How can I transfer the content to a form that Lion will recognize. Sorry if this is a repetition of other queries. Help!!!!

Hi

Having read this topic, it seems you may be able to confirm whether my DVD problem is also with Lion, or at least that I am not alone with it!

I have just exported a 10-minute video from Final Cut Pro X onto a DVD+R disc, using FCPX's share menu. While the DVD plays fine on my DVD player, it hangs and staggers when I try and play it back on the iMac, the same one I created the DVD on. Other, commercial, DVDs play just fine.

I'm running OS 10.7.4 on an iMac with 2.8 GHz i7 processor, which I thought would be fast enough! Is Lion likely to be the problem?

Thank you.

Hi Jonathon, I wish it worked for me with my 2011 iMac, but it didn't. I verified I was in 32 bit mode as well, just to make sure.