I bought a new drive, LH-18A1P, to replace an old one, SOHW-1633S, that was failing to read, and since I have some valuable archive data I decided to scan my DVD library with my new drive. Bad news: PIE and PIF off the chart, several coastered. I reburned everything using onhand media, mostly Memorex +RW (RITEK 004) and Maxell +R (CMC MAG 01), however PIE and PIF remained high (typical PIE max:600 average:400, PIF max:25 average:10.) I tried 2x, 4x, 8x,12x speeds with GLOC, GLOF and GLOG firmware, but results remained unpredictable and many I had to reburn more than once to get something acceptable. I checked Smartburn, DMA, thereâ€™s nothing else on the IDE bus, cables and connectors are clean & tight, no multitasking during burns, etc…
Later I recalled a college friend said he couldnâ€™t afford to replace his DVD drive, so he took it apart, blew it out with canned air, reassembled it, and it worked great. On a whim I tried it, and the results were amazing. Using my old drive, Iâ€™ve rescanned much of my recently reburned media and Iâ€™m getting awesome results, although sometimes thereâ€™s a spike or two that show up in scan statistics as â€œrepaired glitchesâ€. I returned the new drive (it was also an October 2006 pre-updated spindle model that was very loud) and in the future Iâ€™ll buy TY media online, but some questions remain:
Can someone more experienced infer anything about what was the problem with the new drive by comparing the scans, or if you disagree with my evaluation, please tell me why?
What is a â€˜glitchâ€™, how does it affect data integrity, why does the glitch PIF spike not show up in PIE, and how is it repaired?
Are DVD cleaner discs like Allsop effective/safe, and would that help eliminate glitches?