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Originally Posted by JayC30 Scans are used to help keep an eye on the degredation of a disc, when used over time, This can help norrow down what are considered good discs. Over time Verbatim and TY proved themselves to be manufacturers of good quality stuff. |
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Originally Posted by JayC30 A poor scan after a burn could indicate a number of things:
Poor media, write stratagy for a particular MID, bad combination of media/fw/drive, etc. They should not be relied on as the be all and end all of if a disc is good. |
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Originally Posted by JayC30 Some with more experience maybe able to extrapolate a likelyhood of how well a disc can perform overtime from their experience with certaintypes, though this is not a fact of truth. |
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Originally Posted by JayC30 In the example given people maybe waiting to see how well it looks after a scan to see if it has a good compatability with their drive and firmware. If so they may then buy them and then have the test of time to see if they were worth the effort. |
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Originally Posted by JayC30 There is only one true test of coasterdom or good burn and that is: Does the disc work? |
Exactly!
A PI/PIF scan with excellent results
does not mean that:
- what's on the disc is right.
- the disc is going to last more than a week.
- the disc is going to work on every device you put it into!
A PI/PIF scan with poor results
does not mean that
- what's on the disc is not usable
- the disc won't be usable in 2 years of more
- the disc will not work in standalone players.
A PI/PIF scan with good results does mean ...
The drive that you currently have the media in can read the disc well.
A PI/PIF scan with poor results does mean ...
The drive that you currently have the media in cannot read the disc well.
So how are PI/PIF scans to be used???
There must be a common denominator in your comparison & interpretations.
So ... controlled circumstances
ONLY:
- Comparing the same media on the same burner between batches/spindles immediately after burning (or a specified period of time which is consistent for each disc)
- Comparing different media on the same burner immediately after burning (or a specified period of time which is consistent for each disc).
- Comparing different media from the same spindle on different burners immediately after burning (or a specified period of time which is consistent for each disc)
- Comparing the a disc at immediately after burning with the same disc a specified period of time later (aka 6/12/18/24 months later)
Understand what your scanner is doing.
- 8ECC (benq/plextor-default) scanners do not provide for good interpretation of a disc at a single point. A high PIF spike may mean lots of small errors over the 8 ECC blocks, or one huge error at a single ECC block.
- 8ECC (benq/plextor-default) scanners can give EXCELLENT high level understanding about a region on a disc. Aka .. an area with all 1's will show up as a small mountain which indicates that region is more difficult to read than most of the disc.
- 1ECC (liteon/sony/plextor-optional) scanners provide immediate accurate results to the readability of the disc. But determining how an entire region compares to the rest of the disc is next to impossible.