and see if you can see it change color. When burning disks, the burn from the inside out, if I remember correctly.
Does the computer your using have DVD capability?
Can you still access the other computer to retrieve your data?
Rick
Data - repeat - Data files(not video) were written on a DVD using Nero7 in multi session mode. It was probably in UDF. I am not sure. When the DVD is opened on a different computer ( I cannot take it to the original one now) it shows only the first session. While writing, Nero had said the files I was going to write, were of a different formatt and asked permission to change it. I have tried ISO Buster but failed. Tested with Nero7. It shows the disk to be empty. It is a 4.7 GB disk. While writing the last session Nero showed a balance of about 1GB. Thanks to all of you.

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