Of the green line in the middle? (feel free to move to newbie section if needed)
This means that the read speed somehow fell, which could be a way of reducing noise or a riplock, because you were testing an Audio CD.
This is a new acceleration method which must be called Z-CAV.
The green line is the reading speed.
Only an hypothesis, sorry if I’m wrong: do you have DMA enabled?
Yes I believe so. A recent log reads:
DiskPeripheral : HDS722580VLAT20 atapi Port 0 ID 0 DMA: On
CdRomPeripheral : COMBO IDE4816CO atapi Port 1 ID 0 DMA: On
Yep, it’s the reading speed.
Were you doing anything much on your PC whilst you were scanning? Don’t know if it’s relevant, but thought I’d ask
Here’s a scan of the same wavs burnt at 48x. I notice there’s no drop on this, but slightly lower quality ratings
I think that this is a relevant question
It’s possible, but I don’t remember. These audio cd-rs were burnt from wavs by the way, not from a disc image if that makes any difference.
I’ll burn some more audio cd-rs today on the same drive, my external toshiba dvd burner, and post more scans at different speeds. Perhaps I can discover the source of that drop in the reading speed on the 8x burnt disc.
Is DMA being enabled a good thing by the way or should I disable it?
That’s more what I’m used to seeing myself, the read curve anyway.
I tend to burn my audio @ 16x, BTW, but that’s just my preference.
Thanks, Geno…I wasn’t sure, but thought I’d ask anyway
Edit: and enabling DMA is a VERY good idea
DMA should be enabled.
I don’t know exactly, but if you burn from wav files instead from an image computer must do a conversion before to burn data, and this could slow your burn. But your problem is during a [B]scan[/B], so it’s no related to source file types.
If you have a process running in background that use 100% of CPU during a scan it could cause such a speed drop.
Okay thanks, what I will do then is burn another audio cd-r at 8x from wavs on the same drive, with no programs running in the background like before, and this time I’ll make sure there are still no other programs running while I do the scan as well. I’ll do the scan at 8x like before, and use the same drive to scan it as I do burn it as before. & post it
I would just rescan the disc shown in the 8x scan I already posted, but I’m not sure which one it is now
Edit: I’ll use the same media too, Ritek made Memorex Blacks. Forgot to mention that
I prefer to burn at the fastest speed possible to save time, but I did a test on my external drive where I burnt the same wav audio at 48, 40, 32, 24, 16 & 8, & each time I lowered the speed the amount of errors slightly lowered. So it seems that at least on my external burner, lower speed = less errors
A good idea about the scan, if only to rule out other programs causing the slowdown.
I did some experimenting, scanning with and w/o other programs running, & determined that is [I]was[/I] the other programs running in the background that caused the drop in the scan
A belated thanx to everyone who helped me with this issue, peace
Sidenote: use this drive only to compare burns, not to determine abdsolute quality from C1/C2 plots. The scan you originally posted shows that this drive incorrectly reports C1 (see “normal” scans in the blank media test forum )
Do you think that an update to latest version of cd-dvd speed could help too?