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In Reply to: Vibration Control for Importing Cds posted by Shakey on October 16, 2006 at 10:45:13:
This is IT speak in denial that physical phenomena has any effect on data transfer.First vibration is undesirable due to microphony in the electronics. Second, a bit is a bit but how and the timing of its registration (trigger point) in digital electronics affect the accurracy of signal transfer.
Computer people must recognise that there is a physical world around theoretical software operation.
I chose to isolate my HD with Sorbothane gaskets and 1.5 mm lead sheet. I also isolated the computer from the table.
These have the effect of silencing the unit, if not helping the electronics.
Follow Ups:
the data is read as 16 bit words in sequence (serially) from the disk. If you're using EAC, the same word will be read a number of times to ensure that it is exactly the same as the disk value. They are then stored in a sequence that is on your HD and the sequence is managed by the HD filesystem.The Data is read off the hard disk, in the exact same sequence, and sent to the playback device in the same sequence it's pulled from the original disk. As the checksum of the data in vs the data out is the same, the data itself cannot be different.
How does this relate to 'normal' audio - well, those words are read, real time, and fed via data pipes real time to the various processors. The timing is an issue, because it is dependant on the accuracy of the clock, and the design of the circuitry. Also, each word is only read ONCE, so any read will not have a checksum comparison, and the processor has to make to with the data it is presented with. The easier the transports job, the better the data, the better the data, the better the sound. When you're reading the same word 52 times and comparing to work out the actual value, the transport error is practically eliminated from the equation, unless, it has fundamental flaws manifesting as gross aberations. If that is the case, a checksum of the file on disk vs the file on the HD will reveal differences, and you know that there is a problem with the drive.
CDs and Computers work differently.
I am not sure I understand what you are trying to achieve.Are you suggesting that isolating vibrations from the hard drive can improve CD transfers? Maybe, for damaged CDs this might very marginally improve the ability of the CD drive to read the bad data, but I doubt it will be a meaningful affect.
Or, are you suggesting that lead will isolate the RFI noise from the hard drive? Interesting thought, and especially if you have a DAC inside the PC might be of benefit.
Or, are you suggesting that the vibration control and lead will help the hard drive to read data from the hard drive? In this case, I can see no benefit since for most hard drives, and with most software, there are enough buffers to handle most monentary interuptions in data reads. In fact, the lead case might make things a lot worse if the drive runs too hot. This will cause the drive to continually re-calibrate while attempting to read the data, and will shorten the drive's useful life.
Show that sobothane bushings on your hard drive result in less errors per file than not using them. This is easy to do with file comparison software. If you're right, maybe Windows Vista should come with them so everyone has less errors after installing Windows? :)That being said, I use them, but just to help with quieting the drive.
I don't have to prove anything that I did not asssert.
Fmak,Lead sheet may present a health risk. Perhaps placing a lead sheet in several airtight bags solves the problem. Please do investigate further and make an informed opinion.
Rubbish; lead particles are a hazard. Lead sheets cut properly are fine.You won't touch it again once installed.Most European countries use lead in roof flashings.for traditional roofs.
From a health brochure of the US governmentLead can affect childrens
developing nervous systems, causing reduced IQ and
learning disabilities. In adults, high lead levels can cause
high blood pressure, headaches, digestive problems,
memory and concentration problems, kidney damage,
mood changes, nerve disorders, sleep disturbances, and
muscle or joint pain.Looks like spending to much time around your stereo gets you irritated :-)
Yes ingested lead, or particulates. Solid lead sheets cut, sealed and used properly is fine. We in Europe are not idiots.Actually I was head of a Centre of Environmental Studies and understand the environmental health; not jusr read about it.
I am European too btw., however, I have been living in the states for some years.
Fmak, some people in Austria and Germany ingest arsenic and they are not idiots.However, it could be dangerous for someone to try.As of Europeans not being idiots, in the light of the Inquisition, Napoleon, colonial exctermination, WWI, Hitler and Stalin (jointly killed some 2 billion dead) it has to be questioned.
Lead is used not only for roofs, lead is used for water pipes since the Roman times but this is not the point. You did not say that you use sealed lead sheet. Using UNSEALED lead such as lead shot for speaker stands is not a brightest thing to do. I kindly pointed you in the right direction. I had no frigging clue what your expertise is nor intention to insult your intelligence.
If you got offended, I apologize.
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