doctore said:
MagusMagnus said:
You've actually been using CD-RW disks then. You can't do what you're saying you've been doing, with -R disks. Only with -RW disks is that possible and only if you don't write permanently to them (which in Windows is the "Mastered" option instead of the "Live File System" option). So yes, if you want to continue to use disks as you were before and DVD's, you will need DVD-RW's.
This is simply not true. You can have multiple write sessions with cd-r.

The problem could be with the DVD-R brand itself. What was the DVD-R brand and model you bought?
You can write data to a CD-R disk in multiple sessions until the session is closed or the disk becomes full. I've done it many, many times in the past. You can keep adding data to a multisession disk until its full. You can delete files too, you don't get the space back but they are removed from the index of what is on the disk. If you close the session, what is on the disk gets locked and you cannot edit it anymore.