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In Reply to: RE: Would dig hearing a difference posted by JeffH on December 16, 2014 at 07:05:51
As I said below, that would be the 1st step, using 4-5 tracks. If there's no difference that I can detect, there's no point in continuing with larger sample and randomized file names.
Follow Ups:
Also, if you move past the first step, you might try comparing the MD5 checksums of a pair of rips. And if they differ, you might try ripping the same file twice with the same hardware and software and see if the bits differ. There are lots of possibilities here, none too logical, but certainly nothing to rule out.
Alice laughed. "There's no use trying," she said: "one can't believe impossible things."
"I daresay you haven't had much practice," said the Queen. "When I was your age, I always did it for half-an-hour a day. Why, sometimes I've believed as many as six impossible things before breakfast."
Good luck. And yes, I definitely want the files, especially since the earlier ones seem to have disappeared.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Tony, if the MD5 checksums of the ripped files are identical, then it doesn't matter what CD/DVD drive they were ripped from or how those drives were powered.
"Tony, if the MD5 checksums of the ripped files are identical, then it doesn't matter what CD/DVD drive they were ripped from or how those drives were powered."
That is not necessarily so. Unlikely, yes. If I have two files on two different drives and they both have the same MD5 checksum it does not follow that playing them back will result in the same sound quality for reasons that have been thoroughly discussed over the years in this forum. For example, one drive might be an SSD and another spinning rust, etc... The same argument can apply if both files are on the same volume. One might be fragmented, the other might not. For sure they won't share the same sectors on the disk drive. They will have different file names. It is possible to come up with various (more or less unlikely) scenarios whereby two files on the same drive that have the same MD5 checksums might sound different. Of course if you are convinced that there will be no difference and you don't listen carefully there will be a good chance that you will miss the difference that is there. There is the problem of the "unseen gorilla". This is why it is necessary to keep an open mind.
N.B. This line of reasoning does not justify throwing money at scam artists peddling obvious snake oil. But one must keep an open mind and if one does ignore a suspect peddler it may turn out that his snake oil was the genuine article. Although I try to keep an open mind, sometimes this is difficult. However, life is short. Unless someone is paying me well to evaluate a situation or I am devilishly full of curiosity, I tend to pay little heed to suggestions from people whom I've categorized as fools, idiots or assholes. Such characters can be found all over various Internet forums.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
If I have two files on two different drives and they both have the same MD5 checksum it does not follow that playing them back will result in the same sound quality for reasons that have been thoroughly discussed over the years in this forum. For example, one drive might be an SSD and another spinning rust, etc... The same argument can apply if both files are on the same volume. One might be fragmented, the other might not...... etc.Of course, but that is not what is in question here.
Lets say a music file was ripped from a CD using CD/DVD drive A on a switching power supply. Now if that same CD track is ripped again on the same CD/DVD drive A but this time using a linear power supply, and both files are checked to be identical (AccurateRip / MD5), how would those files possibly be different to cause an audible difference?
The point being, it did not matter whether a switching power supply or a linear power supply was used.
Edits: 12/16/14
The point being there are other things that could be happening. Just because a theory says that something is impossible doesn't mean it can't happen. Black Swan Event.
Several possible explanations for these reports come to mind:
1. Files had different checksums.
2. Poster was a liar, sociopath or psychopath
3. Poster thought he heard something but fooled himself
4. Two files differed in location, name or some other factor and this coupled with software bugs/features and hardware characteristics resulted in different sound.
5. There is some new physical mechanism that enables information to be stored in storage devices in "places" that aren't known today.
6. Some other kind of "woo" factor which may be real but doesn't fit into the present world view of Western Civilization and its established religion of Scientific Materialism. (ESP, PSK, Homeopathy fit into these categories. Evidence exists for these, but it is dismissed, even when proponents were well regarded, even former Nobel laureates before they were dismissed as cranks.)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Once #1 is proven, files did not have different checksums, then the point is that it didn't matter whether a switching power supply or linear power supply was used on the CD/DVD drive used to rip the files. Both files are as identical as can be.
Taking it further, even if two different CD/DVD drives were used to rip, and both files checkout identical (AccurateRip / MD5 checksum), then one drive didn't produce a better ripped file than the other.
#2 - #6 are possibilities but not what the OP is trying to determine as best I can tell.
Sorry, the two rip files may have the same MD5 checksum and the same bits stored in them, but they will not be identical. They will have different metadata. They will have different file names and will be stored on different disk sectors. Therefore, the logical axiom of equality is not applicable. Reasoning should be as simple as possible, but not too simple. In this case, your reasoning is too simple.
You can trust me: if I ever get two files that are bit identical that I can hear sound different, I will get to the bottom of the situation, no matter if it is the last thing I do. Every case that I've seen so far has always ended up in one of three ways: (1) the files were not bit identical, (2) the files sounded the same to me on my system, or (3) the files sounded different to me on my system until I found and fixed a problem with my system. For example, I found that two files that had the same bits in them did sound different. Indeed, they sounded different even when playing with the volume control turned all the way down. This was because one file was fragmented and the other was not and it was possible to hear clicks from the disk seeks. The cure was to copy both files to RAM disk and play out of there.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Two ripped files with the same MD5 checksums are identical.... otherwise their checksums would not match. It IS really that simple.
And remember, we're talking only about ripping a file from a CD/DVD drive, not how or where it is stored on the computer's disk or RAM or how it is played back. All of that is 'downstream' and does not matter in the context of what I believe the OP is trying to determine. Only the files themselves are in question for this particular test.
Any differences in sound cannot be attributed to the files if both rips produce the same MD5 checksum.
If you use a linear power supply on the CD/DVD drive or a switching power supply on the same CD/DVD drive, and both rips produce files with identical MD5 checksums, then it did not matter which power was used.
If a difference is heard, it is not due to the files themselves.... It must be downstream.
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