Hi Timothy,

The DVDs in the ChartPack that accompanies Chart Navigator Pro are not rewritable,
what you're describing has not been a frequent problem, and it is highly unlikely that you have a set of bad disks.

Are you certain you have a DVD drive on your computer, rather than a CD drive?

To verify that your computer is not physically able to read any particular disk, you could use My Computer, in XP, or Computer, in Vista, and right-click on the DVD to Explore the disk. If your computer can physically read a disk, you'll see file and folder names listed. If your computer cannot physically read a disk, the computer will spend a lot of time trying to reread the disk, or not acknowledge the presence of the disk in the drive.
Also, if your computer undergoes a drive-related error, you need to reboot your computer in order to be able to use the drive.

Wayne Pearson

Hi Wayne,

I just received the 2008 update DVDs, and I'm running into this problem again.

I'm certain the drives are DVD drives - other data DVDs (and video DVDs) work fine. A newer internal DVD-ROM or DVD+R/RW drive reads the discs fine. The external (USB) drives, or an older internal DVD-ROM drive try real hard to read the disc, but don't succeed.

Would it be possible for me to either a) copy the disc to a USB key on a machine that can read it, b) copy the DVD to another DVD, or c) capture an ISO of the disc and use a virtual DVD utility?

It would be a big hassle to take apart the boat PC now to temporarily hook up an internal drive, and I don't want to buy another external drive to try (I already bought 2).

Thank you,
Tim