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Lokheed
Veteran
Joined: 12 Jul 2004
Posts: 1295
Location: /usr/src/linux
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 Posted: Sat Feb 05, 2005 2:24 am Post subject: Frequent Input/Output errors using DD |
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I have been having a lot of problems using DD to create ISOs from DVDs. Most often than not, I get:
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dd: reading `/dev/hdd': Input/output error
4235728+0 records in
4235728+0 records out
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It varies however. Sometimes it errors right away, other times I can get up to 3.6 G and other times it works. Same DVD (original) everytime, same drive.
Perhaps I am doing something wrong? It just seems really odd.
I am using "dd if=/dev/hdc of=/home/DVD.iso" |
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adaptr
Watchman
Joined: 06 Oct 2002
Posts: 6730
Location: Rotterdam, Netherlands
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| Posted: Sat Feb 05, 2005 2:28 am Post subject: |
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Try setting the blocksize right, first; a DVD normally uses a 2048 byte blocksize.
Then see if dd supports any sort of retry mechanism; all normal optical readers do this, since it is obviously necessary.
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Lokheed
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Joined: 12 Jul 2004
Posts: 1295
Location: /usr/src/linux
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| Posted: Sat Feb 05, 2005 2:42 am Post subject: |
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like this right?
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dd if=/dev/hdc of=/home/DVD.iso bs=2048
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Still odd that it works some of the time and not others...will give it a try though. Thanks. |
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