After upgraded from 800a to 822a, I can burn DVD-R and DVD-RW which is good, no problem. However, there are 2 minor problems:

1. Norton Ghost cannot burn both DVD-R and DVD-RW discs.
2. After burned with NERO, 800a cannot read DVD-RW discs.

Nevertheless, these minus discs burnt with 800a are OK with standalone DVD Players and DVD-Rom drives.