Perfect copies of what?I remember Plextor and Pioneer used to make awesome drives and now pioneer you can barely find and plextor is made by other companies now. The $20 drives are decent but I need something that makes perfect copies. I can't seem to find a high quality drive.
You can still pay $40 for a Plextor if you want to, but I doubt it's twice the quality of the $20 LG/Liteon/Sonys.
http://www.newegg.com/Product/Produc...82E16827249071
Welcome to the race to the bottom. Price beat quality with consumers.
Try DVD-R DL, maybe? Are the maps really >4.35GB? IIRC, your Asus should be a perfectly fine burner for the task. Maybe try burning at a slightly slower speed, too (not too much slower--very slow speeds tend to be worse on modern drives).
Could also be a flaky drive. I had a 2004 Toyota/JBL drive that wouldn't read anything reliably except stamped discs. I had the drive swapped out under warranty and it worked perfectly with burned discs after that.
Not sure where you got the map update from. But if you made a copy of it, it may have copy protection. If so, try making it with CloneCD from slysoft.com .. if it still won't work, then maybe you need to obtain a factory DVD .. I looked and Ebay has a lot of them for around $150 and some are actually Lexus dealers that are selling them.