:a :Z :o
For the following recommendations to be true K-Probe must be set to 8 ECC PI/PO sum while scanning and preferably scanned by a Lite-On DVD-Writer (in other words NOT a DVD-ROM or Combo!).
Scan Speed: 4x Fixed
PI Max: No More than 280
PIF Max: No More than 32
Use this as a guideline for good discs:
PI (Parity Inner): No larger areas on the disc should exceed 280 PI errors, do not worry too much about high single spikes that exceeds 280.
PO (Parity Outer): No larger areas on the disc should exceed 32 PO (actually
PI uncorrectable) errors, do not worry too much about high single spikes that exceeds 32. (Note that this is not completely correct according to the standards, but is still a good guideline, read the first technical post if you wonder why this is not a 100% correct way of reading the results compared to the standards).
Notice that there are other aspects such as disc reflectivity, jitter, tracking errors and so on that also will affect the readability of a DVD disc â€“ but for this we do not have measuring equipment available.
And another note is that we normally scan/recommend scanning the discs at 4X CLV speed since this saves time compared to 2X/2.4X and 1X scanning and still offers CLV reading, but by lowering the speed to 2X(DVD-R/RW)/2.4X(DVD+R/RW) or 1X the amount of reported errors may drop on some discs.
Also using Nero CD/DVD-Speed to do a transfer rate test with a picky DVD-ROM (JLMS XJ-HD165H for example) and see if the reading speed drops is a good indication of the quality of the disc.
A written CD-R disc will always have some C1 errors; C1 errors are easily corrected by the driveâ€™s error correction capabilities. The next level of errors is C2, while C2 errors could also be corrected by most driveâ€™s error correction capabilities; they are not wanted on a good quality disc. A good disc should not contain any C2 errors, and preferably have an average C1 error amount of below 2.0 for the best discs, or at least below 10.0 average for good quality discs. After C2 errors there are only un-correctable errors that will make a disc unusable.