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Originally Posted by ralph79

My first DVD burnt in Nov 2004
MIT Pinky MCC03

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Originally Posted by MacClipper

Come on, let's use our common sense here, if a transfer curve is that bad (with lots of slowdown and rereads) or the errors are sky high, let's trust the reader to use his brains to decide if that media is trustworthy enough. For that moment in time, the disc may be readable with data intact but we can probably expect it to fail later on but that's something like reading into the future - who dares say their disc last forever? Besides, if a disc needs to reread 10x before passing, can we blame only the disc and say nothing about the reader at all... we know that certain burners are barely passable at reading although they may be good at burning.

I will say it again, if a disc can be read or scanned without CRC errors, data integrity is preserved at that moment in time and it is considered a survivor at that time. Let's not clog up this thread with arguments about how smooth or pretty a reading curve needs to be or how many times the disc needs to be read to get the data off. You can do that in your own thread, let's keep it simple here so thread readers do not have to pore through the whole thread just to get what's going on.

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Originally Posted by ralph79

My first DVD burnt in Nov 2004
MIT Pinky MCC03

Originally Posted by MacClipper

Not bad at all, the pinkies have been getting quite a bad rep in this forum and yours have a QS of 98!

Sept 2004, BenQ 8x +R
Have to show a read curve for this one since the PIEs are rather high. But the read curve is perfect at even 16x so data is intact for the moment. Will it survive and for how long? Ask me again perhaps in 6 month's time, I really can't predict the future.

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Originally Posted by MacClipper

June 2004, Mitsubishi Pearl 4x -R (probably oversped at 8x IIRC),

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Originally Posted by wwenze

2 of my more precious discs with >4GB:

Red/Purple MCC 2x -R Singapore burnt in April 2004


Fujifilm TY 8x -R burnt in November 2004


Scanned another TY 8x -R but forgot to save, similar graph nonetheless.
No point scanning the rest as I believe the few of them will have similar results.

Now scanning discs recordered @ <1x by DVD recorder and stored in "normal" conditions and not the cabinet with lowered temperature and humidity.

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Originally Posted by wwenze

M-Star MCC 2x -R, the date stated is 3 July 2003 which I think is wrong. This disc contains Resident Evil movie recorded off TV.


Scans like this make me wonder what's the point of dehumidifiers. But I don't take chances.

EDIT: Oh crap I saved the wrong pic. The speed scan was like those above.

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Originally Posted by MacClipper

Feb 2005, Prodisc F02 silver top - just 7 months old and it looks like crap! No CRC error on copying the data off the disc though.

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Originally Posted by latercomer

thanks for all the efford maclipper. it's really useful for newbs like me. i don't even understand what these terms mean, PI, jitter etc. have to go read up. but like u said, i'm more interested in making sure the data can be accessed like say 6months to 1 year down the road.

i dunno if it's just me, but my normal cd-rs i burn have easily lasted me more than 1 year (i'm saying i can still read the data, dunno about any graphs), and that's why i'm still so hesitant about buying a dvd burner. hopefully this thread will allay my fears?

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Originally Posted by wwenze

I've had more CD deaths than DVD deaths, but that's probably due to more and slightly lower quality discs being used and longer time since burn.

This thread proves good DVD discs last even under room conditions. Cheap DVDs are not assured. But as long as you use good discs and handle them properly, expect at least a year or two of lifespan.

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Originally Posted by MacClipper

To make things really simple for casual readers, you can roughly guage the quality of a disc burn by its Quality Score shown at the bottom right corner of the screen shot.

A perfect disc scan scores 100.

Wolfaro, rather nasty high PIEs on your 8 month young TDK RicohR02 scan (which original burner?), is the read curve OK or even smooth? From experience, BenQ burners are good readers so you may still get a perfectly smooth curve like what I had with my DaxonAZ2 scan posted above.

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Originally Posted by MacClipper

Mine was probably burned on the TDK 1616N as well and if you know that burner, it uses z-CLV for 12x burning speeds (for RicohR02). At each step up in burning speed in z-CLV, the burner has to create links (something like BURN proof technology) and chances for errors are also increased at high speeds as well.

You can see this Freaks post for a burn curve and compare it to the spots where error levels probably correspondingly increase, click.

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Originally Posted by MacClipper

Feb 2005, original Ricoh 8x Gold R02 - never did really like these cos they seem inferior to other RicohR02s eg. TDK and Imation discs. Strange that they supply superior grades to their OEM partners and keep the junky ones for their own retail packaging.

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Originally Posted by ralph79

oh that explains why the sudden increase in PIE on my scans. Thanx Mac.

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Originally Posted by MacClipper

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Originally Posted by ralph79

oh that explains why the sudden increase in PIE on my scans. Thanx Mac.

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