Experimental Data on DVD Longevity

[frank1]

longevity-freak ,

I like to know if you have a "Super Multi" burner such as the LG GSA 4163 B
in order to be able to experiment the longevity behavior of DVD-RAM Maxell 5x certified (MID code MXL 16)

This 5x Maxell DVD-RAM is made with a newly-developed Bismuth Coupling Material (BCM) recording layer
http://www.cdfreaks.com/news/9764
As I said bismuth salts are used in medecine against fever and so on .....

[longevity-freak]

Some dvd disc quality scans on MAM-A 4X DVD-R Archive Gold:

http://forums.hardwarezone.com/showthre ... st15353424

[longevity-freak]

longevity-freak ,

I like to know if you have a "Super Multi" burner such as the LG GSA 4163 B
in order to be able to experiment the longevity behavior of DVD-RAM Maxell 5x certified (MID code MXL 16)

This 5x Maxell DVD-RAM is made with a newly-developed Bismuth Coupling Material (BCM) recording layer
http://www.cdfreaks.com/news/9764
As I said bismuth salts are used in medecine against fever and so on .....

Well, I don't have a dvd writer capable of burning dvd-ram yet. Maybe in the future...

[frank1]

In order to renew this interesting discussion about aging of burned medias
stopped here since the end of July ...


I hope you know about these long lasting and official accelerated aging tests
conducted by the GIPWoG:
"Government Information Preservation Working Group"
for the NIST: National Institute of Standards and Technology:
http://www.itl.nist.gov/div895/gipwog/index.html

I extracted here file the information about the test conditions
from their report published on december the 9th 2004:
http://www.itl.nist.gov/div895/gipwg/StabilityStudy.pdf
to make this info clearly visible to all:


The only thing I find annoying with this official and long lasting tests in that they have not put out any pratical information for users about for example
which labels or MID codes
passed these tests better than others ...
If anybody finds anything practical like that it in all the information they put on-line please tell us !
http://www.itl.nist.gov/div895/gipwog/index.html
Their next meeting will be on October 5th, 2005 at the Library of Congress !!
That's more or less the only practical info I could find ...




-------------------------------------------------
Temperature and humidity:

A Blue M (model: FRM-256B)1 environmental chamber was used to control the temperature and relative humidity through various settings of temperature ( ? 18 °C to ? 93 °C) and relative humidity (5 % to 98 %). The specified control accuracy is ±0.5 °C for temperature and ±1 % for rela-tive humidity (RH) respectively. The test stresses of aging used are given in Table 1.
A complete incubation cycle for temperature and RH accelerated testing is shown in Fig. 1. Once at the stress condition, the temperature and RH were held constant for a period of approximately 45 h followed by a gradual return to ambient conditions. Discs were analyzed after each incubation cycle. This cycle was repeated under the same stress condition until the error rate of most discs in the group increased to exceed an upper limit of the error rates (as indicated in the DVD and CD specifications) or until the disc became unread-able.













--------------------------------------------------------
Light exposure:

A light chamber was designed and built at NIST to meet the requirements for controlled light exposure (Fig. 2). Two cylindrical light bulbs were placed vertically in the center of the chamber, with up to twelve discs placed at equal distance from the light source. Intensity was measured at each disc location to check uniformity. The discs were installed with the recordable side facing the light source.
Two 150 W metal halide (M-H) [7] bulbs were used for the light source, giving a 47.5 mW/cm2 light inten-sity at the disc surface. Light intensities were measured using a Scientech Victor S310 thermo-power meter with shield tube. The wavelength range of the metal halide lamps is similar to sunlight, centered at 500 nm, and partly extending to UV region.
Disc Analyzers: In order to monitor the change in the error rate during aging, discs were analyzed after each incubation cycle using disc analyzers. A CD-R analyz-er capable of reading BLER (in the case of CD) and a DVD-R analyzer capable of reading PI error was used.
DVD-R Analyzer: The DVD 1000P analyzer con-forms to DVD specifications and was capable of testing electrical, digital, and mechanical parameters in DVDs, including PI errors, PO errors and jitter.
CD-R Analyzer: The CD CATS SA3 Advanced allowed measurement of all relevant CD disc parame-ters including BLER, E32 errors and jitter. All measure-ments are performed according to optical disc industry standards.






Fig 2 - Chamber for controlled light exposure

[frank1]

So the discussion does not start with concentrating on that a particular point,
I corrected in the info that I extracted something what I think is probably a typographic error:
on Page 2 of the PDF file you can read: " from -18°C to -93°C "
There is something surprising about these minus °C temperatures ...
[minus 93°C nearly never occurs on earth]

But then in the stress test conditions they give:
" Test stress: 60 °C to 90 °C, 70 % to 90 % RH "
Maybe they wanted to write: ~18 °C to ~93 °C ?? [~ : around]


So maybe somebody has to e-mail the GIPWoG
so they correct the typography in their report ...

[dodecahedron]

a snow-blizzard at night-time during winter in Antarctica, possibly ?

[tony_g]

a snow-blizzard at night-time during winter in Antarctica, possibly ?

Possible but not very likely. At the new (under construction) US Antarctica Research station, the builders have a "300 club" when the temp hits minus 100F (-73c) they sit in a +200F suna and then go run around outside...buck naked!
But I'd say -93c is VERY rare...plus "325 club" just doesn't have the same ring to it

[longevity-freak]

Contents Page updated.

Contents Page (Part One)

http://forums.hardwarezone.com/showpost ... ostcount=1

Contents Page (Part Two)

http://forums.hardwarezone.com/showpost ... ostcount=2

[longevity-freak]

Updates:

http://forums.hardwarezone.com/showthre ... e=59&pp=15

[longevity-freak]

Disc quality scans of Made in Japan discs:

http://forums.hardwarezone.com/showthre ... e=60&pp=15

[longevity-freak]

References to news articles at Government Computer News.com and The Wall Street Journal Online:

http://forums.hardwarezone.com/showthre ... st17655415

[longevity-freak]

More updates:

http://forums.hardwarezone.com/showthre ... e=60&pp=15

[dolphinius_rex]

I would just like to say thank your to Longevity-Freak for continuing to post these updates. I for one am reading them, and find them quite interesting!

Anyone else keeping an eye on these things??

[VideoRoy]

I would just like to say thank your to Longevity-Freak for continuing to post these updates. I for one am reading them, and find them quite interesting!

I agree, thank you.

Anyone else keeping an eye on these things??

I am now

[longevity-freak]

More interesting updates:

http://forums.hardwarezone.com/showthre ... e=62&pp=15

[longevity-freak]

I would just like to say thank your to Longevity-Freak for continuing to post these updates. I for one am reading them, and find them quite interesting!

Anyone else keeping an eye on these things??

Thank you, dolphinius_rex.

[longevity-freak]

I would just like to say thank your to Longevity-Freak for continuing to post these updates. I for one am reading them, and find them quite interesting!

I agree, thank you.

Anyone else keeping an eye on these things??

I am now

Thank you, VideoRoy.

[Gabe]

I take a look on your tests, too

[Scour]

Hello!

Yes, I take from time to time a look on the tests, because I had also bad experiences with some media

[longevity-freak]

Recommendations by University of Washington with regards to Environmental Requirements for Storage Media Stability:

http://forums.hardwarezone.com/showthre ... e=62&pp=15

[longevity-freak]

Test results on the lifespan of various brands of dvd recordable media are here:

http://forums.hardwarezone.com/showthread.php?t=991675&goto=lastpost

More tests coming...

[dolphinius_rex]

Wow... that's some serious pain with the Sony 8x DVD+Rs!!!

[longevity-freak]

Wow... that's some serious pain with the Sony 8x DVD+Rs!!!

Sigh...I was actually hoping for almost zero failure rate for all my discs stored in dry boxes.

[Scour]

Wow... that's some serious pain with the Sony 8x DVD+Rs!!!

Remember, this media was also not good in the c´t-review, but 08D1 was more worse

Edit: Taiwan or Austria-media?

[longevity-freak]

Wow... that's some serious pain with the Sony 8x DVD+Rs!!!

Remember, this media was also not good in the c´t-review, but 08D1 was more worse

Edit: Taiwan or Austria-media?

Those Sony 8X DVD+R discs tested are made in Taiwan.