Sorry, your posts have had so much information inconsistencies that it has become a little difficult keeping the chain of events clean and on track. Now that I know that you actually have 10.6 on the external drive I'm sure that you are right in that the problem was caused by 10.6
The same thing happened to Western Digital drives when 10.5 came out. It's still a firmware issue with Western Digital. Many other hard drive manufacturers have not had a problem with external FW drives with either OS. All of mine work fine. From this, and the fact that WD has already proven that they don't do well with FW firmware implementations, I've again lowered my estimation on WD MyBook drives and will continue to counsel my clients to avoid that product.
The statement that "lots of other peripherals are also not working for lots of other folks under firewire" doesn't change your WD problem at all. I'm sure that other manufacturers have also cut corners. SL can not keep high performance and reliability with just part of the firewire protocol working, sort of. Windows does that, and those machines suffer the performance issues that kill a machine. Many other manufacturers of FW hard drives have not had any issues with Leopard, and now Snow Leopard.
All they had to do was plug in peripherals and see if they were working during beta testing of 10.6. If you are saying that Apple had no need to do that, then we have a difference of opinion.
I'm not saying that Apple had no need to do that. I did say that it doesn't matter if the drive doesn't work. If there is a firmware issue due to not fully implementing a protocol (especially when other companies have), then the drive is not suitable for Snow Leopard at all, and hardware that is not reliable has no place on this OS.
I have no idea what's causing your problem with the external firewire burner. Both of mine work well. I have several of them due to internal optical drives going south during Tiger and Leopard.
Did every outside vendor's chipsets and firmwares suddenly became unstable under 10.6 because they are all faulty or was 10.6 too big a change for any of them to handle due to Apple's not paying attention to external connections and their needs?
No
My vote is against Apple.
There are millions of successful installations, with various hardware's that render your 'vote' meaningless.
Meanwhile, while you have a laundry list of complaints you never said (AFAIK) what brand and model of external burner you are trying to use. That would be very interesting, as if the firmware is the problem and is related to a sloppy error correction routine in firewire I'd like to know what equipment to dodge. WD and Buffalo are already established as flakey, what others?
I assume your reference to Canon, HP, and Epson is related to printer/scanner driver issues. Are you also having these issues, or just bulking up your list?
Apple makes mistakes, too. Let's be big enough to admit it.
This has always been true. There are many examples of changes they've had to make by releasing system updates. The most recent being the problems relating to wireless connections while on battery power. They have admitted that they caused the problem, and they will fix it. This has nothing at all to do with firewire drives, or the Buffalo USB drives that don't work well. The subject of this thread is specific to firewire drives, and listing all of the other kinds of problems does not support your vote and only creates confusion.
If you keep on track we may be able to help or fully understand a particular issue. As for me, I'm happy my firewire peripherals are working well with SL. If they didn't I'd change them for better quality components or revert to a less picky OS, like Leopard or Windows. I wouldn't want to try to make a less than perfect firmware work in a high performance environment. The data is too precious.