[gentoo-user] sha1sum of cd

[gentoo-user] sha1sum of cd

[Jorge Almeida]

I've downloaded a KNOPPIX cd and burned it onto a cd via cdrecord (k3b having recently evolved to
brain death). The command was
 	cdrecord  dev=/dev/hdc KNOPPIX_V3.9-2005-05-27-EN.iso
The sha1sum of the downloaded image is
51294cb7439a127efd36f819f636208163988972, which is what it's supposed to
be.
The cd boots, but something seems wrong ('ls /etc' hangs forever, and
segfaulted once).  So, maybe the burning was not right. I tried
 	$ cat /dev/hdc|sha1sum
 	cat: /dev/hdc: Input/output error
 	8d792624cfe365a1b8ee1e9f06fe3520c28d91cc  -
Then,
 	$ dd if=/dev/hdc of=knoppix.iso
 	dd: reading `/dev/hdc': Input/output error
 	1425088+0 records in
 	1425088+0 records out

 	$ sha1sum knoppix.iso
 	8d792624cfe365a1b8ee1e9f06fe3520c28d91cc knoppix.iso
Last, I followed Zac Medico's suggestion in the "md5sum error" thread:
 	$ readcd dev=/dev/hdc sectors=0-$(isoinfo -d -i /dev/cdrom | grep
 	"Volume size is:" | grep -o "[0-9]*$")  f=- | sha1sum
 	Read  speed:  7042 kB/s (CD  40x, DVD  5x).
 	Write speed:  2818 kB/s (CD  16x, DVD  2x).
 	Capacity: 356298 Blocks = 712596 kBytes = 695 MBytes = 729 prMB
 	Sectorsize: 2048 Bytes
 	Copy from SCSI (1,0,0) disk to file '-'
 	end:    356296
 	addr:   356296 cnt: 84
 	Time total: 160.792sec
 	Read 712592.00 kB at 4431.8 kB/sec.
 	51294cb7439a127efd36f819f636208163988972  -

So, "there is order in this madness".

Can someone explain the meaning of this?


Jorge Almeida
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Re: [gentoo-user] sha1sum of cd

[Zac Medico]

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

Well, readcd works well for a cd while dd and cat do not. ;-)

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.

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.

Zac
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Re: [gentoo-user] sha1sum of cd

[Jorge Almeida]

On Mon, 8 Aug 2005, Zac Medico wrote:

> Well, readcd works well for a cd while dd and cat do not. ;-)
>
> 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.
>
> 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.
>
> Zac
>
Thank you, readcd is one more command worth learning.

Jorge
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gentoo-user@gentoo.org mailing list

Re: [gentoo-user] sha1sum of cd

[Iain Buchanan]

On Tue, 2005-08-09 at 00:18 +0100, Jorge Almeida wrote:
> I've downloaded a KNOPPIX cd and burned it onto a cd via cdrecord (k3b having recently evolved to
> brain death). The command was
>  	cdrecord  dev=/dev/hdc KNOPPIX_V3.9-2005-05-27-EN.iso
> The sha1sum of the downloaded image is
> 51294cb7439a127efd36f819f636208163988972, which is what it's supposed to
> be.
> The cd boots, but something seems wrong ('ls /etc' hangs forever, and
> segfaulted once).  So, maybe the burning was not right. 

try burning another at a lower speed.  I sometimes get weird cd errors
from burning too fast for the media / writer / universe.

HTH,
-- 
Iain Buchanan <iaindb@netspace.net.au>

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Re: [gentoo-user] sha1sum of cd

[Iain Buchanan]

On Tue, 2005-08-09 at 10:47 +0930, Iain Buchanan wrote:
> On Tue, 2005-08-09 at 00:18 +0100, Jorge Almeida wrote:
> > I've downloaded a KNOPPIX cd and burned it onto a cd via cdrecord (k3b having recently evolved to
> > brain death). The command was
> >  	cdrecord  dev=/dev/hdc KNOPPIX_V3.9-2005-05-27-EN.iso
> > The sha1sum of the downloaded image is
> > 51294cb7439a127efd36f819f636208163988972, which is what it's supposed to
> > be.
> > The cd boots, but something seems wrong ('ls /etc' hangs forever, and
> > segfaulted once).  So, maybe the burning was not right. 
> 
> try burning another at a lower speed.  I sometimes get weird cd errors
> from burning too fast for the media / writer / universe.

oops, I got lost in all the sha1sums...! I didn't realise the first and
the last ones were the same.  Oh well, it may be a knoppix bug then - is
there a knoppix users list?
-- 
Iain Buchanan <iaindb@netspace.net.au>

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Re: [gentoo-user] sha1sum of cd

[Zac Medico]

Iain Buchanan wrote:
> 
> oops, I got lost in all the sha1sums...! I didn't realise the first and
> the last ones were the same.  Oh well, it may be a knoppix bug then - is
> there a knoppix users list?

The problem he reported is really quite typical of unionfs problems.  No doubt, many other knoppix users have experienced this.

Zac
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