Burning DVD+R DLs on 10.5.7 -- no more!
Before the usual suggestions come pouring in, here's what I've done so far:
*I've tried burning with Toast, Disk Utility, and iDvd.
*I've tried saving as a disk image first and then burning in a subsequent step with Toast or Disk Utility.
*I've blasted my SuperDrive (Matshita UJ-846, Firmware FQ3T/MMC-3) with canned air.
*I've successfully burned both data and VIDEO_TS folders to single layer DVDs.
*I've tried switching brands, using both Verbatim (which always worked before) and Memorex. (I haven't been able to find Maxells yet, but as soon as I do I'll give them a try too.)
*I've tried slowing the burn speed down as far as it will go (2x in Toast).
*I've deleted the prefs for Toast and Disk Utility.
*I've successfully read single and dual layer DVDs by playing them in Front Row or copying data from them.
Based on these experiments, I've arrived at a couple of conclusions:
*The problem is confined specifically to burning DL DVDs. It does not affect burning single layers, nor does it affect reading from the SuperDrive, which (mercifully) suggests it is not a hardware problem.
*The problem only seems to have cropped up since the problematic 10.5.7 upgrade. Admittedly, I don't remember when the last time I tried to burn a DL disc was, perhaps back to 10.5.5 or so, but in any event it seems to be of recent origin.
*The hardware error is usually indicative of incompatible media, but I am using one of the brands (Verbatim) most highly recommended in the forum, and one that has always worked reliably in the past. I did think to try switching to DVD-R DLs (as opposed to DVD+R), but those are nearly impossible to find retail.
*The error at 50% might suggest that the burner isn't "turning the corner" onto the second layer of the media.
So I guess what I'm asking is:
*What am I missing? (I'll get started: I haven't zapped the PRAM yet, and I haven't tried more extreme cleaning methods like a cleaning disk or the credit card swipe).
*Are other users having this kind of problem? I've heard elsewhere in this forum and on the interwebs about software upgrades changing the conditions and compatibility of their burners: suddenly certain media types are no longer supported, speeds have to change, etc. But is that case specifically attested with 10.5.7 or even 10.5.6? (By the way, System Profiler still lists DVD+R DL as compatible.)
*How do I get back to burning Dual Layer DVDs?
Any and all help is appreciated in advance. Cheers.
MacBook Pro 17" 2.16GHz, Mac OS X (10.5.7)

