Madness

Made a DVDFab backup, of a DVD, to put in a +R/DL disc. This is the second of two; first burned successfully, but the second pops up the titular error. What's it mean? I've included a screenshot & the relevant section of the logs. imgburnlog.txt

I don't think that the drive is dead; I recently burned five more perfect SL disks (from the same spindle). The drive came w/ 8L06 firmware, but I tried updating to 8L08 about 6 months ago. I found that it seemed to induce errors when burning dual-layer. Made two burns, two different movies & there were sector errors, in the exact same locations, on both. Downgraded back to 8L06 & reburned those same two films; they were perfect.

I included the selection from the log for this & a second failed finalize burn (different movie). burnfail.txt

Was trying to burn a DVD film from an ISO (a backup from DVDFab). It gets through the burning & then seems to have trouble finalizing the disk. Subsequently, it will not play in any DVD deck. This error is taken from the log: Potential 'WaitImmediateIO' Deferred Error - (99%, 0/3) - Program Memory Area Update Failure Finalise Disc Failed! - Reason: Program Memory Area Update Failure The media used was Verbatim MCC-0400-00 +R burned @ 8x; drive is a Lite-On iHAS220 & OS: Windows 7HP x64. Ideas?