code65536 wrote:there was one person at CDF who posted scans of the same disc scanning on a 3S drive and on a 2S drive, and the 3S reported many more errors than what the 2S drive reported.
MediumRare wrote:... the results are extremely interesting.
I think the error rate reported from this drive varies
drastically between CAV and CLV. Here are the results from the same disc I scanned with my LTD-163 DVD-
ROM (as reported
here). I normally use KProbe for scanning, but here I want to show the scanning speed and the quality test option of CD DVD Speed combines this with the PI/PIF plot. First of all, a scan at 4x CLV:
This shows large error counts. Now here is a scan at 6x (CAV):
Note that this starts at ca. 3x, passes 4x at ca. 1 GiB and reaches 6x at the end. There is roughly
a factor of 40 between these cases! Here is a summary of all scans I did with this disc. The corresponding results for my DVD-ROM are shown
here and do not show this behaviour.
- Code: Select all
General Information
Drive: LITE-ON DVDRW SOHW-1213S
Firmware: TS08
Disc: DVD+R (RICOHJPN R01)
Selected speed: 1 X 2 X 4 X 6 X Maximum
PI errors
Maximum: 28 219 610 62 163
Average: 3.67 80.12 373.59 8.40 23.95
Total: 33689 1101912 5582295 91131 300152
PI failures
Maximum: 11 25 10 11 14
Average: 0.18 0.35 1.37 0.26 0.30
Total: 3149 4117 24502 3404 3595
PO failures: n/a n/a n/a n/a n/a
Jitter: n/a n/a n/a n/a n/a
Scanning statistics
Number of samples: 119594 115560 110236 109371 92423
Average scanning
interval: 1.06 ECC 1.10 ECC 1.15 ECC 1.16 ECC 1.38 ECC
Glitches removed: 0 5 20 8 26
G