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How to interpret PI/PO error scans

Discussion in 'Optical Storage & Writing' started by ultim, 27 Jan 2006.

  1. ultim


    Joined: 6 Jan 2006

    Posts: 973

    Location: Midlands

    How to interpret PI/PO error scans?

    Can someone tell me how to read PI/PO error scans. ive just did one and dunno if its good or not.


    Lower the numbers the better?
    Last edited: 27 Jan 2006
  2. >:|sh4d0w|:<


    Joined: 21 Feb 2004

    Posts: 2,911

    Id scan with CDSpeed2000 or possibly Kprobe. i say cdspeed2000 as its very widely used and thus easy to compare settings etc.
  3. smids


    Joined: 18 Dec 2004

    Posts: 6,660

    Location: London/Kent

    That's a *decent* burn (as in average) - better than my current cheap media (ran out of Verbatim and desperately needed to offload stuff). Should I just bin it? My Verb's with MCC was hitting about 90%+ (one was a good solid 99% until one HUGE spike dropped it to 85% (dust, fingerprint?)

  4. rubberduck


    Joined: 8 Feb 2004

    Posts: 4,227

    A few pointers

    Here is what I know

    1) Some drives are good for scanning discs, some are not i.e. inaccurate results... I know NEC are bad, Liteon, Plextor and Benq are considered good. Liteon drives are generally considered the best however.

    2) To scan a disc use a suitable speed... Generally it is 5x for NEC drives and 8x for Benq, Plextor and Liteon

    3) Use K-probe for Liteon drives and Nero Cd speed (free) for other drives

    4) An ok burn is will generally have less than 1000 PO error with less than 500 being good and less than 200 being outstanding. Also you don't really want any peaks of 12 or more on the whole disc.

    5) An ok burn will have an average PI of less than 20, good less than 10 and outstanding less than 5. Look out for peaks of say 120 or more.

    6) If your drive supports jitter make sure the value is less than 15%. At 20% playback of video can cause a problem

    7) Do a transfer rate test using Nero CD/DVD speed... Look for a smooth curve with no drops in speed.

    8) Go over to www.cdfreaks.com (forums) to learn more.... Sorry I dont know too much about your drive so some of my information may be untrue.

    Thats about it... I'd say you're burn is ok (PI a little high) and you'll have no playback problems, given the media though you could probably do much better with a few pointers from the above site.

    Hope that helps.

  5. I would also highly recommend www.speedlabs.org ,smaller site, more specialised, highly talented users, and not hostile to newcomers.

    Zebra and I will be hanging around here a bit, so can answer specific questions if you like. The burn scan at the top of this thread is an excellent burn, and close to as best you can expect. both PI and PIF ar very low. That said, although the Pioneer drives are arguably the best burners around, their scanning routines are not the best by far. The best scanning drive around would be the Benq 1640, 1655 or similar.


    Author DVDInfoPro
  6. zebra


    Joined: 10 Jan 2006

    Posts: 2

    Hi guys,

    smids: Do not bin your media mate. Generally speaking, there is FAR FAR FAR more to optical write quality than parity scans. Infact, a professional media analysis/industry user RARELY relies on parity alone to test the integrity/write quality of their hardware/media combinations.

    It is my very strong suggestion that you do a few things, to test the global write quality of your discs:

    i. Do a CRC scan - FIRST AND FOREMOST (Magnifying glass in DVDInfoPro)

    ii. Do an RPM Scan as well!

    iii. Go and do your parity scan, after these two have shown no real problems

    iv. Finally, set-top playback is the "Acid test" per se.

    Keep in mind, parity scans in these applications (as good as DVDInfoPro is), are NOT the "whole" story. One must build a complete picture of the write quality, using a combination of tests. As end users, you don't have the ability to measure:

    i. Optical sphericity
    ii. Axial-push/pull
    iii. BLER co-efficients
    iv. Media Geometry....

    So you need to do the next best thing, combining an RPM, CRC and Parity scan, with playback test....to ultimately arrive at a conclusion!

    As the big man said above. Come over to speedlabs.org if you are really interested in this stuff, on a deeper technical level. (You might even learn more about the advanced functions of DVDInfoPro....hence the industry rely on the tool so heavily)

    Hope it helps! :)
  7. smids


    Joined: 18 Dec 2004

    Posts: 6,660

    Location: London/Kent

    Hey, thanks for the info. Set-top testing was fine on a stand alone dvd player (sony model) and CRC was fine. Only the PIPO scan was the cause of concern but as you state there are more factors involved so I'll stick it out (getting more Verb next time though!).
  8. zebra


    Joined: 10 Jan 2006

    Posts: 2

    Excellent! Let us know how you go with future burns. :)
  9. smids


    Joined: 18 Dec 2004

    Posts: 6,660

    Location: London/Kent

    Will do. In fact, I've been browsing speedlabs recently - that's where I've been getting my firmware for my 110D @ nullz buffalo mod 8.37 (currently from rcp1 but I had the A10XL firmware and guide from speedlabs). Might read a few guides on this though.