MacClipper
High Supremacy Member
- Joined
- Jan 1, 2000
- Messages
- 33,617
- Reaction score
- 4
Just thought of another way of approaching the subject matter which is hopefully more direct and constructive making it easier to understand for the casual reader. I think there are enough threads detailing which media is bad etc running into pages and pages referencing innumerable websites... this thread is more about media which has been shown to survive ie. Got Scan Can Talk!
CRITERIA
1. Media must be burned more than 6 months ago
2. 0 media sense errors
3. passed Transfer Speed test (a nice to have but optional requirement since standalone DVD machines play at only 1x speeds)
4. 0 PO Failures (? importance since POF doesn't always mean that the data is unretrievable)
SCANNING SETUP
1. Scanning burners - BenQ DW series (8x scan speed) recommended eg. 1620/1625/1640 since they can report PO failures (and jitter too). Other burners like Liteon (4x)/NEC (5x) models can also do error scanning but without PO Failure reports.
2. using CD-DVD Speed (freeware, latest version is 4.01), Click to download
If you do not own a BenQ DW16xx series burner, you are still welcome to post your scans too using other tools eg. good CD-DVD Speed Transfer Curves for non-error scanning models eg. LG burners.
You are also welcomed to add your own comments on the disc/media eg. rate of survival, label surface durability, pictures etc...
REASONING
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. Let's keep it simple, clean and to the point here so thread readers do not have to pore through the whole thread just to get what's going on.
I will posting the scans of my own discs which has been stored in spindle cases (pressure effects) by my room window which is exposed to sunlight (UV exposure as well as increased heat). No special care has been taken of them cos I wanted to see the effect of accelerated ageing on the discs (which has no impt unique data, of course).
The scans will run against the current mood in this forum which has repeated ad nauseum that DVD media cannot survive long term - so I am prepared to be accused again of having a vested interest in optical media industry. Just for clarity, I am not in this or any IT related industry at all, my main line is totally non-related as those who know me on a personal basis can attest.
btw, bad scans does not always equate disc degradation cos you can always get a fresh bad burn (with a bad scan).
Advisory
Anyway, just a little sidetrack to clarify my own stand that I am just a ODD fan without any commercial interests cos I am not even in the IT line at all. Here's MichaelTan of Convergent himself in his own words,
http://forums.vr-zone.com/showpost.php?p=745691&postcount=105
from this thread, click
Oh well, that's for all it's worth.
My rambling initial observations with regards to to longterm durability 3+ years down the line. (24/3/09).
1. Local SG climate (heat, sun, humidity...) is very harsh on DVD media, overseas findings are mostly not applicable here.
2. MIJ or MIS quality is not an impt factor.
3. Price is not an impt factor.
4. A beautiful inital burn scan is almost meaningless.
5. Outer edge degradation is a very common problem.
6. to be cond...
Since this sub-forum has been mercilously edited to kill off older threads losing valuable info, a sister thread has been stickied over at VRZ.
VRZ Sticky
CRITERIA
1. Media must be burned more than 6 months ago
2. 0 media sense errors
3. passed Transfer Speed test (a nice to have but optional requirement since standalone DVD machines play at only 1x speeds)
4. 0 PO Failures (? importance since POF doesn't always mean that the data is unretrievable)
SCANNING SETUP
1. Scanning burners - BenQ DW series (8x scan speed) recommended eg. 1620/1625/1640 since they can report PO failures (and jitter too). Other burners like Liteon (4x)/NEC (5x) models can also do error scanning but without PO Failure reports.
2. using CD-DVD Speed (freeware, latest version is 4.01), Click to download
If you do not own a BenQ DW16xx series burner, you are still welcome to post your scans too using other tools eg. good CD-DVD Speed Transfer Curves for non-error scanning models eg. LG burners.
You are also welcomed to add your own comments on the disc/media eg. rate of survival, label surface durability, pictures etc...
REASONING
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. Let's keep it simple, clean and to the point here so thread readers do not have to pore through the whole thread just to get what's going on.
I will posting the scans of my own discs which has been stored in spindle cases (pressure effects) by my room window which is exposed to sunlight (UV exposure as well as increased heat). No special care has been taken of them cos I wanted to see the effect of accelerated ageing on the discs (which has no impt unique data, of course).
The scans will run against the current mood in this forum which has repeated ad nauseum that DVD media cannot survive long term - so I am prepared to be accused again of having a vested interest in optical media industry. Just for clarity, I am not in this or any IT related industry at all, my main line is totally non-related as those who know me on a personal basis can attest.
btw, bad scans does not always equate disc degradation cos you can always get a fresh bad burn (with a bad scan).
Advisory
Anyway, just a little sidetrack to clarify my own stand that I am just a ODD fan without any commercial interests cos I am not even in the IT line at all. Here's MichaelTan of Convergent himself in his own words,
http://forums.vr-zone.com/showpost.php?p=745691&postcount=105
from this thread, click
MichaelTan said:...The incredibly strange thing is, the people who are in the IT industry, meaning the people with a passion for hardware when they were kids and went ahead to look for a job to reflect their passion - meaning, go into the IT industry - now all kenna ban.
...
So who's left? I know only one (besides students), and that's Macclipper, who's not in the IT industry. Booest, Driftdriver, cyberazi, stratix, denniszz, corbell, Trichard, deathdealer, krado, P4CoverclockerII, oOKelvinOo, cannot post. Hell, Shamino cannot post...
Oh well, that's for all it's worth.
My rambling initial observations with regards to to longterm durability 3+ years down the line. (24/3/09).
1. Local SG climate (heat, sun, humidity...) is very harsh on DVD media, overseas findings are mostly not applicable here.
2. MIJ or MIS quality is not an impt factor.
3. Price is not an impt factor.
4. A beautiful inital burn scan is almost meaningless.
5. Outer edge degradation is a very common problem.
6. to be cond...
Since this sub-forum has been mercilously edited to kill off older threads losing valuable info, a sister thread has been stickied over at VRZ.
VRZ Sticky
Last edited: