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On Tue, Jun 2, 2009 at 7:42 PM, Paul Hartman |
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<paul.hartman+gentoo@×××××.com> wrote: |
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> On Tue, Jun 2, 2009 at 8:03 PM, Mark Knecht <markknecht@×××××.com> wrote: |
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>> Hi, |
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>> I've got a bit of a problem recently with (I think) k3b. Over the |
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>> last couple of months *some* copies of CDs made in k3b using the Clone |
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>> Copy feature do not reliably play in my car's CD player. I've tried |
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>> multiple CD spindles and I've tried burning the copies on two |
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>> different Gentoo machines - one 32-bit and the other 64-bit - with the |
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>> same results. The thing that is VERY strange about this problem is |
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>> that some CDs and all copies of those CDs play fine. For other CDs the |
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>> originals play fine but every copy I make fails, and if they fail, |
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>> they fail using either Gentoo machine to copy them. (Hope that's |
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>> clear....) |
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>> |
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>> I'm wondering if there is a program that can verify the contents of |
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>> each CD against each other, bit for bit, to identify whether this is a |
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>> problem on all of my computers or whether it's something about my |
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>> car's CD. The strange thing is that the original CDs play fine in the |
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>> car. It's only the copies that sometimes don't, and it's only the |
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>> copies of *some* CDs, not all CDs. |
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>> |
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>> I've been using these same machine and same car CD player for years |
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>> and everything has always been fine. Now for the last 2-3 months |
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>> nearly 50% of what I copy fails. |
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> |
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> I don't think there's a way to do bit-for-bit compare of audio CDs... |
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> if it's a burning issue I would try burning at a slower speed (as slow |
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> as you can tolerate waiting for). |
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> |
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> Maybe your car's CD player/laser is dying. Perhaps try taking some old |
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> CDs that you know used to work and see if they still play okay. The CD |
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> player in my car for the past month or so has decided to be unable to |
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> play a CD without skipping like crazy. It is maddening. |
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> |
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> |
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Reading around on the web I got pretty much the same picture - that |
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it's not possible to verify 100% bit-for-bit that an audio CD is |
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identical. Still, I would think that if I made whatever the 'iso' is |
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of a single CD twice and compared the two of those I'd expect them to |
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be the same, but maybe we cannot really guarantee the burning |
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operation is exactly bit-for-bit. I don't know. |
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|
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It likely is the car's CD player but it's been hard to prove so far. |
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It plays all originals fine. It plays most copies fine. However it |
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fails on all copies of certain CD lately no matter what Gentoo machine |
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I burn them on. Strangeness. |
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|
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Thanks for answering back! |
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|
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- Mark |