ddrescue/ubuntu not identifying disks

[Al Grant]

Hi Folks,

I thought when I discovered ddrescue that it would be somewhat of a pancea, and image anything I threw at it - I had after all heard very good things about it, I was in some respects glad to get away from windows.

While I admit to still being in my early days of Ubuntu, I have discovered that two disks I have tried to image lately do not show up under a fsdisk -l, and accordingly I cant image in ddrescue.

They do show sometimes in dmesg that they have been assigned sdc or whatever, but the rule seems to be if it dont show up in fdisk -l then it cant be imaged - or am I missing something?

Anyone know any different?

Cheers

-AL
PS: On these defective disks I have had excellent success with getdataback to get the files off, but of course getdata back doesnt do images.

[Tom-331]

I have found that sometimes a disk does not show up in Ubuntu but
works perfectly using SystemRescueCd which is a gentoo live cd.
SystemRescueCd includes ddrescue.


http://www.sysresccd.org/Main_Page



On Fri, Jul 31, 2009 at 1:55 PM, Al Grant<bigal.nz@...> wrote:

>
> Hi Folks,
>
> I thought when I discovered ddrescue that it would be somewhat of a pancea,
> and image anything I threw at it - I had after all heard very good things
> about it, I was in some respects glad to get away from windows.
>
> While I admit to still being in my early days of Ubuntu, I have discovered
> that two disks I have tried to image lately do not show up under a fsdisk
> -l, and accordingly I cant image in ddrescue.
>
> They do show sometimes in dmesg that they have been assigned sdc or
> whatever, but the rule seems to be if it dont show up in fdisk -l then it
> cant be imaged - or am I missing something?
>
> Anyone know any different?
>
> Cheers
>
> -AL
> PS: On these defective disks I have had excellent success with getdataback
> to get the files off, but of course getdata back doesnt do images.
> --
> View this message in context: http://www.nabble.com/ddrescue-ubuntu-not-identifying-disks-tp24750661p24750661.html
> Sent from the Gnu - ddrescue mailing list archive at Nabble.com.
>
>
>
> _______________________________________________
> Bug-ddrescue mailing list
> Bug-ddrescue@...
> http://lists.gnu.org/mailman/listinfo/bug-ddrescue
>

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[Al Grant]

 Excellent tip -I will try it.

Thanks

Tom-331 wrote:

I have found that sometimes a disk does not show up in Ubuntu but
works perfectly using SystemRescueCd which is a gentoo live cd.
SystemRescueCd includes ddrescue.


http://www.sysresccd.org/Main_Page



On Fri, Jul 31, 2009 at 1:55 PM, Al Grant<[e-mail]> wrote:
>
> Hi Folks,
>
> I thought when I discovered ddrescue that it would be somewhat of a pancea,
> and image anything I threw at it - I had after all heard very good things
> about it, I was in some respects glad to get away from windows.
>
> While I admit to still being in my early days of Ubuntu, I have discovered
> that two disks I have tried to image lately do not show up under a fsdisk
> -l, and accordingly I cant image in ddrescue.
>
> They do show sometimes in dmesg that they have been assigned sdc or
> whatever, but the rule seems to be if it dont show up in fdisk -l then it
> cant be imaged - or am I missing something?
>
> Anyone know any different?
>
> Cheers
>
> -AL
> PS: On these defective disks I have had excellent success with getdataback
> to get the files off, but of course getdata back doesnt do images.
> --
> View this message in context: http://www.nabble.com/ddrescue-ubuntu-not-identifying-disks-tp24750661p24750661.html
> Sent from the Gnu - ddrescue mailing list archive at Nabble.com.
>
>
>
> _______________________________________________
> Bug-ddrescue mailing list
> [e-mail]
> http://lists.gnu.org/mailman/listinfo/bug-ddrescue
>


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[Todd Colvin]

If they are IDE drives, I've also run into the problem and have had success experimenting with jumper and connection settings. For example, sometimes I have had to put the drive on an IDE channel all by itself and/or set the jumpers to cable select instead of master (and sometimes the other way around).

I would also check your BIOS to see if the drives are being detected. If they are not, then I suspect the hardware is having problems detecting the drives rather than the OS. But if they show in the BIOS, and IDE and jumper settings are not the issue, then I would also try using System Rescue CD.

Todd

On Jul 31, 2009, at 3:33 AM, Al Grant wrote:

Excellent tip -I will try it.

Thanks


Tom-331 wrote:

I have found that sometimes a disk does not show up in Ubuntu but

works perfectly using SystemRescueCd which is a gentoo live cd.

SystemRescueCd includes ddrescue.

http://www.sysresccd.org/Main_Page

On Fri, Jul 31, 2009 at 1:55 PM, Al Grant<bigal.nz@...> wrote:

Hi Folks,

I thought when I discovered ddrescue that it would be somewhat of a

pancea,

and image anything I threw at it - I had after all heard very good things

about it, I was in some respects glad to get away from windows.

While I admit to still being in my early days of Ubuntu, I have

discovered

that two disks I have tried to image lately do not show up under a fsdisk

-l, and accordingly I cant image in ddrescue.

They do show sometimes in dmesg that they have been assigned sdc or

whatever, but the rule seems to be if it dont show up in fdisk -l then it

cant be imaged - or am I missing something?

Anyone know any different?

Cheers

-AL

PS: On these defective disks I have had excellent success with

getdataback

to get the files off, but of course getdata back doesnt do images.

--

View this message in context:

http://www.nabble.com/ddrescue-ubuntu-not-identifying-disks-tp24750661p24750661.html

Sent from the Gnu - ddrescue mailing list archive at Nabble.com.

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Bug-ddrescue mailing list

Bug-ddrescue@...

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_______________________________________________

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Bug-ddrescue@...

http://lists.gnu.org/mailman/listinfo/bug-ddrescue

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View this message in context: http://www.nabble.com/ddrescue-ubuntu-not-identifying-disks-tp24750661p24753641.html
Sent from the Gnu - ddrescue mailing list archive at Nabble.com.



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[andrew zajac-2]

I actually look at the logs and follow what the kernel is trying to do with the hardware.

tail -f /var/log/messages

In the case of a disk that is "undetected" but still appears in /proc/partitions, you can see what exactly is going on.  If a drive keeps resetting itself, you may have to keep trying to initiate ddrescue as fast as you can by hitting Cursor-Up and then Enter to re-run the last command.  Sometimes, it's not about what OS you are using, but getting the timing right.

Andrew


--- On Thu, 7/30/09, Al Grant <bigal.nz@...> wrote:

From: Al Grant <bigal.nz@...>
Subject: [Bug-ddrescue] ddrescue/ubuntu not identifying disks
To: Bug-ddrescue@...
Received: Thursday, July 30, 2009, 11:55 PM

Hi Folks,

I thought when I discovered ddrescue that it would be somewhat of a pancea,
and image anything I threw at it - I had after all heard very good things
about it, I was in some respects glad to get away from windows.

While I admit to still being in my early days of Ubuntu, I have discovered
that two disks I have tried to image lately do not show up under a fsdisk
-l, and accordingly I cant image in ddrescue.

They do show sometimes in dmesg that they have been assigned sdc or
whatever, but the rule seems to be if it dont show up in fdisk -l then it
cant be imaged - or am I missing something?

Anyone know any different?

Cheers

-AL
PS: On these defective disks I have had excellent success with getdataback
to get the files off, but of course getdata back doesnt do images.
--
View this message in context: http://www.nabble.com/ddrescue-ubuntu-not-identifying-disks-tp24750661p24750661.html
Sent from the Gnu - ddrescue mailing list archive at Nabble.com.



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