Updated my MKIV DVD navigation computer with the V32 firmware and replaced the BMW 2004 map disk with my own disk I burnt with the 2015 map data but the navigation system would return intermittent errors about unable to read the map disk about 30% of the time. Tried Verbatim DVD-R, Magnavox DVD-R and Memorex DVD-R all causing read issues. Thought my MKIV DVD lens was on its way out...

I then decided to try a Memorex DVD+R disk and works like a charm!
Have rebooted the navigation system many times and no disk errors are seen.
Have never experienced a DVD drive favoring one format over the other (DVD-R vs. DVD+R) until now...

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Current stable of BMW vehicles:
2010 E92 335Ci
2005 E53 X5 4.4i
2002 E36/7 M Roadster
2004 R1150RT