Just passing along the kindness and generosity shown me by the regulars here. This place is simply an incredible resource, and some seriously generous people here who go out of their way to help. ... but, the bottomline is people are willing to help those who are willing to put in the time themselves, right?
Scan #1. QS 95, PIE 46 max (<280), PIF 8 max (<16), POF 0 ... those numbers look fine. The 244,245 PIE total is high but I think still within DVD spec. PIF total 3,238 is ok but I'd be more comfortable below 2000.
Scan #2. QS 95, PIE 49 max (<280), PIF 8 max (<16), POF 0 ... again, looks ok. Again, the high PIE / PIF totals are still good enough .. but for long term storage I'd prefer to see lower totals (esp. PIF totals). The scan looks ok tho.
3. QS 88, PIE 61 max (<280), PIF 17 max (>16), POF 0 ... the PIF spikes and bunches at the beginning and end of the disc would make me a little nervous, but it should still playback. PIE totals are ok and the graph looks good. 11,022 PIF total is higher than what I'd be comfortable with.
... try playing these discs back on your reader/player to find out where their tolerances are for PIE/PIF ranges.
... I'll keep echo'ing what everyone has said already ... if you want better results, give yourself the best chance to achieve it by treating yourself to high quality media (imo TY or Verbatim). You'll be pleasantly surprised in the improvement in your scan results ... it may just 'buy' you a sense of 'security' if you plan to archive important data.
If it's mission critical data that you can't afford to lose, Kenshin made a great suggestion about making multiple backups. For example if you have a 1.3 GB data file, put 3 copies of it in the dvd. That way, you're protected in 3 different zones of the dvd ... increasing your salvage chances if something bad occurred in certain areas of the media. Or, if it's a larger file, then make multiple backups placing the file in different sections of the disc. ( I believe NERO burns in the order that you add to your compilation ... don't quote me on this though ).
If you're worried about media quality, buy yourself some peace of mind by using high quality media to start with. Cheap media doesn't seem worth the fuss for critical data storage.
'Data integrity' can be tied to the quality of the media, burner's compatibility with media, resulting burn quality, and subsequent media handling and storage. tonkins made some great points about storage conditions (btw, there are many threads addressing this in the forums here) - ie. store them in a cool, dark, non-humid (if possible) place. Definitely out of sunlight ... and reach of curious 5 year olds. Lol.
If it's really important archiving, definitely must use high quality media, and some suggest burning at the rated speed of the media to get the best burn (opinions will vary as burner compatability / performance thus varies).
Some people suggest using black color dvd cases (not the ones with clear lids) to block out the sunlight. Media wallets aren't usually recommended because of the excess pressure on the discs when the wallet is full (and typically a wallet full of dvd's will be slightly more 'bulky' than if filled with cd's). If you prefer to use wallets, keep them stored vertically (not horizontally b/c of the pressure directly on the discs) and don't fill them up to the point the sides are bulging when you zip it up.
The simplest way to do it is just keep 'em in the spindles they came in.
That is not good at all. 0 QS may still playback, but I wouldn't trust it to store critical data onto. Even presence of PO Failures will still playback in many cases. If you keep getting 0 QS scores, you may have a bad batch of media ... or simply, your burner/firmware doesn't really like that media choice.
I'll premise by saying each drive has different preferences for firmware / media. But, say, TY's on your 1640 ... if burning 8x, I would expect to see PIE ttls <60,000 (<20k or <10k for some), PIF ttls <1,000 (<200 or <100 for some), and QS's in the 90's (95-99 for some). Check out the Benq 1640 media thread for reference ( but be aware most people are posting their best burns .. with some ok/mediocre burns sprinkled in ).
Lol. If you never ventured to this site, you wouldn't think twice about your burns. If NERO said it "completed successfully", that'd be the end of it. You'd only know good (working) and bad (not working).
I can definitely 'feel your pain' as there is a lot to digest. But, in the end, it's a personal preference. Is there a big real-world difference b/t a 99QS and a 97 QS? B/t a 2,000 PIF total and a 200 PIF total? It may not make much difference ... because all that tells you is what you START with quality wise. As tonkins said, from there on, you're at the mercy of so many other external factors.
It may be a bit overwhelming, but it's definitely worthy knowledge. You now have the right frame of mind for planning your burns and taking care of them thereafter.
.......... Btw, I think you've just opened the floodgates of curiousity into the burning world, so I realize there are many questions on your mind. Do yourself a favor and spend some time researching through the forums. Use the SEARCH function and scan the thread headings, and you'll see most of your questions have already been addressed. If you show you put some work into it, the people here are very generous about giving advice. Good luck! .........