I recently built a PC for my girlfriend and bought a BenQ DW-1655 as DVD writer.
She tried to watch some AVIs (King of Queens from TV ) I had burnt onto a Verbatim DVD+R 16x (MCC 004 00) with my Plextor PX-716A. I had scanned that disc on my Plextor, and the burn was really perfect. The disc was in perfect shape, no scratches, no dust, not even the tiniest bit. My girlfriend reported that some of the files hung after some minutes, and first I scanned the disc with Nero CD/DVD-Speed. I made a speed test, and there was a reduction in read speed somewhere in the last 3rd of the disc. But additional benchmarks showed a smooth curve. Strange.
Next, I tried PIE/PIF scans with Nero CD/DVD-Speed at 8x. After a short while, around 120 MB if I remember correctly, the scan seemed to hang. It took quite a while until it continued, and it showed lots (tens of thousands!!) POFs, and of course a quality index of 0. But since the read speed benchmark did not show any read errors, this scan result is of course nonsense. PIEs and PIFs stayed at normal levels, they were quite good. The quality index was almost 100 before the POFs. The scan hung again and again as it continued, and I stopped it very soon because it was useless.
I tried firmwares BCDB, BCGB and BCHB: no differences.
I scanned a MCC 003 I had burnt with the DW-1655 itself: same problem. The disc is readable, Nero compared it without problems with the original data, but a scan at 8x failed with bullsh... results.
I tried scans at 4x, they were better, but some time later, they hung as well, and lots of POFs were shown as well.
Sooo... what could be the reason for these scanning problems? The discs are obviously fine. Is the drive defective? Are there other programs I could use to make PIE/PIF scans?