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Opinion on KProbe2 scan

Discussion in 'DVD±R media' started by knight76, Mar 13, 2007.

  1. knight76

    knight76 Member

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    Hi everyone.

    I am new to all this media rating and checking scans for quality etc. I used to just stick the disc in, burn it max speed and chuck it somewhere for storage.

    I am slowly trying to make sure my burns last longer and are more reliable as backups. I take a lot of photos these days and do not want to lose these.

    So any thoughts on the quality of this scan would be appreciated.

    This was burned with Nero7 Ultra at 4x on TDK DVD-R. Kprobe scan done with default settings at 4x. Burned on Lite-on LH-18a1p DVDRW.

    [​IMG]
     
    Last edited: Mar 13, 2007
  2. JoeRyan

    JoeRyan Active member

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    The scan is OK but not great. There are speed-related increases in PIE errors at two points on the scan and a spike in PIF at the very end. Only the spike is above the specifications for DVDs. The correlation of the PIF spike with a spike in PIE suggests a physical flaw on the disc. In many cases that can be a bit of transient debris on the disc that may have left a "shadow" on the disc even afer the debris fell off. It can also be a flaw in the coating at that point. Only a visible inspection will determine what caused it.

    K-Probe varies from Lite-on to Lite-on drive, but it is a more critical tool than Nero CD/DVD Speed in determining errors. The average error results suggest that this disc should have no playback problems except in the most finicky of players.
     
  3. knight76

    knight76 Member

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    Oh ok. So really, the Blue section (PI) should be fairly level all the way across and without the mountains of mine. The red section should be mixed 1's and 2's with no real spikes too much above this.

    Is good to know the disk will read in all but the most finicky drives. Do you get that info from the PI and PIF max results or just generaly looking at the red and blue section.

    Also, can you work out how long the media should last approximately from these results?

    Thanks for the advice
     
  4. JoeRyan

    JoeRyan Active member

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    A perfect scan would show no colors at all--but nothing in life is perfect. The best discs will have a level blue line running no higher than about 10 and just a few red spikes that hit no higher than 1. That assumes that your drive can actually produce such readings even from "perfect" media. The error rates are due to the recording drive, the disc, and the reading drive in combination.

    All recorded optical media increase in errors over time. That's why it is important to get the initial errors as low as possible to start. Knowing that TDK generally uses azo cyanine dye is an indication that the disc should last a long time (up to 30 years or so if it is not mechanically damaged), but that is only an inference. Jitter readings and other data would give a better picture because even good initial reports of PIE and PIF errors do not take into account how well the edges of the recording marks are made. The sharper they are, the better.
     

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