The DVD forum is in the middle of deciding the fate of "DRT-DM" (Distributed Read Time Defect Management) for DVD-RW format. The DVD+RW format already has announced plans for adopting Mt. Rainier with the 3rd generation DVD+R/+RW recorders, while so far, the DVD Forum didn't announced anything similar. Now DVD Forum considers to adopt similar technology to Mt. Rainier for the DVD-RW format!
The following article comes from original Japanese text so there might be errors:
"...The main difference between DRT-DM and the Mt.Rainier, is that DRT-DM refers not only for data record, but also for real time uses (like DVD-Video recording format). The DRT-DM format will adopt the "UDF v2.0" as the file system. There will be 5 stages of protection, two levels for real time record and three levels where high reliability is required
The three levels are "Light Weight Defect", "Heavy Weight Defect" and "Media Hard Defect". At the first level (Light Weight Defect) the error can be restored using the error collection, but it won't protect against future serious errors. At the second level (Heavy Weight Defect), errors are recovered with the retry and error collection, but also there is the possibility that future errors will not be recovered causing seeking error. The two levels cannot be used with AV record since there would be a decrease of performance.
When the new DRT-DM format adopted, it would need Microsoft's support for WinXP and future operating systems..."