Some data DVD's and External Hard Drives not recognized by Leopard only.

1] Some data DVDs that were burned under Tiger do not show up in Leopard. Only a dialog box asking what I want to do with the blank DVD comes up when I insert the disk. On my Tiger computer, the disk shows up perfectly fine. It is a DVD+R being used on a MBP 2ghz... and was burned on that very machine in Tiger and would load fine in Tiger. Now nothing on the same computer in Leopard. I'm going to reburn the disk on my Mac Mini on a DVD-R, but still wanted to know any ideas or input as to why it won't recognize the disk.
2] I also have an external USB2.0 HD. I formatted the disk using my G4 Mac Mini (which has Tiger) and it is not recognized on my MBP. In Disk Utility I try to reformat the drive, but it says that it cannot do so because the "resource is busy". I plug the drive back into the mac mini and it works perfectly fine. Why would this be and how do I correct it?
Full updates on both OS's. No other problems with either computer that I know of.

Unfortunately, commercial DVDs that you have bought 99.9% of the time will be copy protected and Apple's forum terms prohibit discussion of circumventing the copy protection.  In various places circumventing digital copy protection is potentially illegal even if you own and intend to keep the DVD.  Hence Apple do not wish DVD rippers etc discussed here.
Another problem is that AppleTv cannot play back DVDs copied to an external drive as it does not understand the format.  So even if you can 'copy' your DVDs you then need to convert to h264 format to play on AppleTV.
Video formats for AppleTv are limited.  They also do not support DVD like menu structures (thogh AppleTV 1 did with itunes Extras movies).
If you have unprotected video you wish to convert eg home video on DVD, then something like Handbrake or MPEGStreamclip with Apple's MPEG2 component might do the job.  These programs are not DVD rippers but can process unprotected MPEG2 video.
AC

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