One of the main purposes I use DVD-RWs for is burning test images before I commit to burning an unchangeable write-once disc. The fact I am totally unable to do this for dual layer DVDs is stupid as hell. JVC was apparently about to release some in August of 2007 but blu-ray burners became a thing and they dropped the concept, I'm pretty sure. If it ever did make it to shelves it was in incredibly small numbers in Japan only. RIP.