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In Reply to: I'm confused posted by andy_c on August 26, 2006 at 07:21:08:
Hellosorry if I should have confused you and other readers.
I am ripping in secure mode, of course. What I was talking about, was not the ripping speed, but the DRIVE speed you can set in "drive options".
What I noticed was only a (possible) behaviour of the error correction and/or the ability to read a CD without errors.In the drive options, you can either allow the drive to spin at max. speed or set a certain, let's call it, speed limit.
When EAC extracts data from the CD (that's how I understood that option), it reads a certain portion of the disc as long until EAC is convinced it has captured the data without any errors. If this is not possible at the maximum drive speed set in "drive options", the disc is spun down (even to 1x or less drive speed) until the data is captured, or error correction jumps in or EAC gives up on that portion.
So, as far as I understood it: when the speed option is set to max., EAC uses the max. drive speed of your drive as long as possible. If drive options are set to 12x, EAC initially lets the drive spin with a max. drive speed of 12x.
On the other hand, you can imagine, that a drive-speed of let's say 40 (again: the drive itself spins with 40x, I am not talking about extraction speed!) may cause the laser to loose focus or jump out of the "groove". That's why I imagined, that a lower drive speed in options (let's say 12x) would make work easier for the laser pickup to follow excentricities, refocus on the pits etc., since the CD spins slower. It's like driving: following a small lane with 40 mph is easier than with 100 mph...
But the red error correction dots show more activity with lower drive speeds than with max. speed. That's, what my question was about...
Sorry again, if I may have caused confusion. I hope, my answer has clarified my point and question.
Follow Ups:
You should set the speed to "Actual" and "Allow Speed Reduction During Extraction". This allows EAC to adjust the drive to the ideal speed based on error readings AND the quality of the individual disc in the drive.
Hi
and thanks for the advice - I had "speed reduction" already ticked and now have chosen to set my drive to "actual". It was an interesting experience to me, that maximum read speeds (especially towards the end of the disc, when ripping speed displayed in "secure mode EAC" goes up to 6 - 7x) provide better results than when the drive is limited to a lower read speed, which theoretically at first sight seems to be easier for the laser...
I looked at that option (in Drive options, Offset/speed tab, speed selection). According to the tooltip help, the options in the combo box are drive dependent. I have two computers with two drives each, and it turns out the only option I have here on all of my drives just says "Actual". That's why I was confused, because I've never seen any numbers in this combo box, just "Actual". I guess I've just always ignored it for that reason :-). Thanks for the clarification.Have you tried "test and copy selected tracks" to do multiple passes and compare CRCs for test and copy? If so, do you get mismatched CRCs at all? If not, maybe the best thing is to just use the fastest speed that gives no mismatched CRCs with a scratched disc.
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