Updating 2.4x DVD+R/+RW drives for 4x media compliance

[LTR12101B]

http://www.dvdrw.com/productupgradeportal/index_en.html

This will NOT make your drive a 4x, but should make it tolerant of 4x media.

Some DVD-R drives also require updates, but I don't know of a similar "central resource".