“This is reflected in the CONTROL field of mode 1 Q sub-channel.”
DVDs don’t have sub-channels so it’s not possible to use that method of determining the recording type as being DAO (sequential) or packet (incremental).
Quotes below are from author of dvd+rw-tools at http://fy.chalmers.se/~appro/linux/DVD+RW/
“Disk-at-once and Incremental recording strategies are applicabe to DVD-R media and DVD-RW media in Sequential mode.”
“Sometimes DVD+RW/+R recording strategy is referred to as packet writing. I myself am reluctant to call it so (or TAO/SAO/DAO) for the following reason. Despite the fact that DVD-R[W] provides for lossless linking (within a packet/extent only), packets/extents are still denoted with certain linking information which distinguishes it (recording mode in question) from e.g. Disc-at-once. Now the point is that written DVD+RW/+R media, rather its Data Zone, does not contain any linking information and is logically indistinguishable from one written in DVD-R[W] Disc-at-once mode (or DVD-ROM for that matter).”
It’s not a good idea to make comparisons with these 2 very different types of ODs. They each have different physical structures and thus different write methods. Somehow the terms DAO & Packet found their way into discussions about DVD write types but this is misleading.
I don’t know the reason for your question but if you are trying to learn about DVD write methods forget about CDs and start from scratch.