DVD drive cannot read some of my data dvd's

When I put in some of my data dvd, it reads it as a blank media.
It is strange. I can read data of the exact same DVD in another mac computer.
The problem is I can read some, but some I cannot read. Burning is no problem / no errors.
Any thoughts would be great! Thanks
Message was edited by: vc187

Wow, that's interesting.
I haven't had a problem with reading discs in my Powerbook (yet to really use the DVD drive in my MBP), but my old 1999-vintage iMac DVSE with it's DVD-ROM drive often won't read burned DVDs. It has no trouble with commercial discs, or burned CD-Rs, but it fails to read DVDs on a seemingly random basis. Indeed, I had been importing video on my Dad's G5, and burned it to DVD-R (Verbatim). The iMac wouldn't read the discs, while all our other DVD reading Macs would.
I wonder if it's not the write strategy? I know different drives/applications have various methods for burning discs. See Wikipedia's optical disc article: http://en.wikipedia.org/wiki/Opticaldiscdrive

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