No, I don't work for Apple, Dave.
If you read my previous post in this thread you will see that I say that :
In almost all cases these problems are occurring because the drives concerned are either dirty or defective. It is not the sort of issue which an OS update will fix.
I am very tired of people assuming that if they wait for the next "OS" or "firmware upgrade" or some such it will fix the issue. It won't.
Apple, unfortunately in my opinion, advise against cleaning these drives. That is fine for the owner when they are under warranty and no doubt brings in a few dollars from repair services! Apple simply replace the drive in such circumstances. It is mighty expensive, however, if you have to pay for the drive yourself.
My own experience, however (based on using Macs with slot loading drives over many, many, years) is that regularly cleaning them can prolong their lives dramatically . It is not a panacea, but it has kept the slot loading drives on many of the Macs that I look after running for a long, long time, and "resurrected" many drives that other people had given up on. In fact I doubt that many of these drives that are more than a year or two old will continue to operate properly WITHOUT regular cleaning.
The drives that Apple use are exactly the same as the drives installed by most other reputable manufacturers and they suffer problems at about the same rate. Bleating about 'defective Apple drives" is really no more sensible than bleating about "defective Dell drives" or "defective Thinkpad drives" and the like. They are all victims of the nature of technology and none are "better" or "worse" than the others from what I can see of the statistics.
When one of these drives ceases functioning properly (regardless of the brand of computer), or doesn't do all that it should, one has two choices. Try to fix it or replace it. If it is under warranty the answer is simple. Take it back and get it replaced.
If it is not under warranty however, replacing it is going to cost you quite a bit of money. The first step is to try to clean it. It works for a lot of people and it doesn't work for others. If it doesn't work and you are out of warranty then you fork out your $$$ for a new one, but I sure as heck would prefer to try a cleaning disk before forking out for a drive replacement.
There are two things that usually "kill" DVD burners. Dirt on lenses and deteriorating or misaligned lasers. Dirt happens all the time. It gets flung around by spinning discs, seeps in from people's cigarette smoke, you name it. Lasers are susceptible to both heat and age, both of which are unavoidable in a notebook computer. The two processes are not independent but additive. An ageing laser is more affected by a dirty lens than a new one and vice versa.
As long as people have Applecare or a warranty, fine! Get the drive replaced! Once you are out of warranty, however, and have to pay for the replacement yourself, then cleaning the drive as a first step makes one heck of a lot of economic sense. It won't work for all but it does work for many, saving them a lot of dollars.
But don't kid yourself either , that there is something peculiarly "problematic" about the drives that Apple use. They are just the same, from the same manufacturers, as the ones that you will find in most quality notebooks, suffer the same sort of (high) failure rates, and are susceptible to the same problems.
I'm not for a moment suggesting that cleaning the drive will fix them all (regardless of brand) , but it still makes danged good economic sense as the "first step" when you run into disk burning or reading problems and your drive is out of warranty. I'm amazed at how many people never even bother to try it!
Heck, if I had simply replaced all of the optical drives in the out of warranty Macs in use in our household instead of cleaning them when problems first arose I'd have spent a couple of thousand dollars! As it is, as luck or otherwise would have it, with a bit of regular TLC they are all (touch wood - from a sample of an iMac G3 slot loader, a G3 and a G4 iBook, an iMac G5, two MB's and two MBPs) still working fine!
Cheers
Rod