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Jorge Almeida wrote: |
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> I've downloaded a KNOPPIX cd and burned it onto a cd via cdrecord (k3b |
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> having recently evolved to |
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> brain death). The command was |
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> cdrecord dev=/dev/hdc KNOPPIX_V3.9-2005-05-27-EN.iso |
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> The sha1sum of the downloaded image is |
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> 51294cb7439a127efd36f819f636208163988972, which is what it's supposed to |
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> be. |
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> The cd boots, but something seems wrong ('ls /etc' hangs forever, and |
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> segfaulted once). So, maybe the burning was not right. I tried |
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> $ cat /dev/hdc|sha1sum |
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> cat: /dev/hdc: Input/output error |
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> 8d792624cfe365a1b8ee1e9f06fe3520c28d91cc - |
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> Then, |
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> $ dd if=/dev/hdc of=knoppix.iso |
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> dd: reading `/dev/hdc': Input/output error |
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> 1425088+0 records in |
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> 1425088+0 records out |
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> |
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> $ sha1sum knoppix.iso |
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> 8d792624cfe365a1b8ee1e9f06fe3520c28d91cc knoppix.iso |
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> Last, I followed Zac Medico's suggestion in the "md5sum error" thread: |
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> $ readcd dev=/dev/hdc sectors=0-$(isoinfo -d -i /dev/cdrom | grep |
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> "Volume size is:" | grep -o "[0-9]*$") f=- | sha1sum |
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> Read speed: 7042 kB/s (CD 40x, DVD 5x). |
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> Write speed: 2818 kB/s (CD 16x, DVD 2x). |
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> Capacity: 356298 Blocks = 712596 kBytes = 695 MBytes = 729 prMB |
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> Sectorsize: 2048 Bytes |
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> Copy from SCSI (1,0,0) disk to file '-' |
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> end: 356296 |
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> addr: 356296 cnt: 84 |
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> Time total: 160.792sec |
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> Read 712592.00 kB at 4431.8 kB/sec. |
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> 51294cb7439a127efd36f819f636208163988972 - |
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> |
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> So, "there is order in this madness". |
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> |
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> Can someone explain the meaning of this? |
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> |
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> |
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> Jorge Almeida |
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|
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Well, readcd works well for a cd while dd and cat do not. ;-) |
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|
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The ls /etc hang and segaufault sounds like a unionfs problem (known bugs). If you do dmesg|tail you will probabably see evidence of a unionfs error/oops. |
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|
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I've been using a unionfs snapshot from 4/19 for the longest time because I have found later versions to be too unstable for my liking. |
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|
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Zac |
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-- |
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