I burned a CDROM a short while back, and now can't get the **** thing to
mount (even though it would have been checked as OK prior to storage). As
its got data on it that is no longer available from source, I'm wondering
if anybody has any favorite tricks they've used to force a mount.

Its a cheapo Memorex thing from some supermarket, and the data was
originally on an ext2 file system. The data is a collection of MP3
lectures, and was burned as data (not as an audioCD) to this CDROM using
Brasero on a Zenwalk-5.2 OS.

I've tried the usual "auto" and "ext2" mount options, and the "-s" sloppy
mount flag, but the best I can manage is a lot of disk spinning, followed
by a report that the resource is read only (its not) and a mount screen
report about "No such file or directory" available.

Just to be sure I'd actually managed a burn in the first place, I dropped
the disk into a burn process in XFburn (the app I'm currently using on
Slackware) and, as expected, got a report that the CDROM disk was full.

There is no visible evidence of damage on the disk itself. Its shiney new.

I'm open to suggestions about now. Clues anyone?

--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

Mike Jones wrote:
>
> I burned a CDROM a short while back, and now can't get the **** thing to
> mount (even though it would have been checked as OK prior to storage). As
> its got data on it that is no longer available from source, I'm wondering
> if anybody has any favorite tricks they've used to force a mount.
>
> Its a cheapo Memorex thing from some supermarket, and the data was
> originally on an ext2 file system. The data is a collection of MP3
> lectures, and was burned as data (not as an audioCD) to this CDROM using
> Brasero on a Zenwalk-5.2 OS.
>
> I've tried the usual "auto" and "ext2" mount options, and the "-s" sloppy
> mount flag, but the best I can manage is a lot of disk spinning, followed
> by a report that the resource is read only (its not) and a mount screen
> report about "No such file or directory" available.
>
> Just to be sure I'd actually managed a burn in the first place, I dropped
> the disk into a burn process in XFburn (the app I'm currently using on
> Slackware) and, as expected, got a report that the CDROM disk was full.
>
> There is no visible evidence of damage on the disk itself. Its shiney new.
>
> I'm open to suggestions about now. Clues anyone?
>



try it on another machine

On 2009-11-02 12:08, Mike Jones wrote:
>
> I burned a CDROM a short while back, and now can't get the **** thing to
> mount (even though it would have been checked as OK prior to storage). As
> its got data on it that is no longer available from source, I'm wondering
> if anybody has any favorite tricks they've used to force a mount.
>
> Its a cheapo Memorex thing from some supermarket, and the data was
> originally on an ext2 file system. The data is a collection of MP3
> lectures, and was burned as data (not as an audioCD) to this CDROM using
> Brasero on a Zenwalk-5.2 OS.
>
> I've tried the usual "auto" and "ext2" mount options, and the "-s" sloppy
> mount flag, but the best I can manage is a lot of disk spinning, followed
> by a report that the resource is read only (its not) and a mount screen
> report about "No such file or directory" available.
>
> Just to be sure I'd actually managed a burn in the first place, I dropped
> the disk into a burn process in XFburn (the app I'm currently using on
> Slackware) and, as expected, got a report that the CDROM disk was full.
>
> There is no visible evidence of damage on the disk itself. Its shiney new.
>
> I'm open to suggestions about now. Clues anyone?
>

The filesystem on your cdrom is not ext2, it's probably iso9660.
Try to read from the cdrom device, with dd or mk5sum and see if you
get errors.

There is a tool named ddrescue that can continue to read even if you get
block errors, and if you save it to a file, and once you have the file,
try to play it with mplayer to see if there is any hope at all to get the
mp3 files back.

/bb

On Mon, 02 Nov 2009 11:08:10 GMT, Mike Jones wrote:
>
>
> I burned a CDROM a short while back, and now can't get the **** thing to
> mount (even though it would have been checked as OK prior to storage). As
> its got data on it that is no longer available from source, I'm wondering
> if anybody has any favorite tricks they've used to force a mount.

Just for fun, try
mount -t auto /dev/xxxx /some_mount_point_here

Responding to philo:

> Mike Jones wrote:
>>
>> I burned a CDROM a short while back, and now can't get the **** thing
>> to mount (even though it would have been checked as OK prior to
>> storage). As its got data on it that is no longer available from
>> source, I'm wondering if anybody has any favorite tricks they've used
>> to force a mount.
>>
>> Its a cheapo Memorex thing from some supermarket, and the data was
>> originally on an ext2 file system. The data is a collection of MP3
>> lectures, and was burned as data (not as an audioCD) to this CDROM
>> using Brasero on a Zenwalk-5.2 OS.
>>
>> I've tried the usual "auto" and "ext2" mount options, and the "-s"
>> sloppy mount flag, but the best I can manage is a lot of disk spinning,
>> followed by a report that the resource is read only (its not) and a
>> mount screen report about "No such file or directory" available.
>>
>> Just to be sure I'd actually managed a burn in the first place, I
>> dropped the disk into a burn process in XFburn (the app I'm currently
>> using on Slackware) and, as expected, got a report that the CDROM disk
>> was full.
>>
>> There is no visible evidence of damage on the disk itself. Its shiney
>> new.
>>
>> I'm open to suggestions about now. Clues anyone?
>>
>>
>
>
> try it on another machine


Done that already.


--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

Responding to Bit Twister:

> On Mon, 02 Nov 2009 11:08:10 GMT, Mike Jones wrote:
>>
>>
>> I burned a CDROM a short while back, and now can't get the **** thing
>> to mount (even though it would have been checked as OK prior to
>> storage). As its got data on it that is no longer available from
>> source, I'm wondering if anybody has any favorite tricks they've used
>> to force a mount.
>
> Just for fun, try
> mount -t auto /dev/xxxx /some_mount_point_here


Done that already, and 'mount -s -t auto /dev/xxxx /some_mount_point'


--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

Hello,

bb a écrit :
>
> There is a tool named ddrescue that can continue to read even if you get
> block errors, and if you save it to a file, and once you have the file,
> try to play it with mplayer to see if there is any hope at all to get the
> mp3 files back.

Will mplayer be happy to be fed with a filesystem image ?
If not, you can try to recover files from the filesystem image with
photorec, which is part of the testdisk package.

Responding to Pascal Hambourg:

> Hello,
>
> bb a écrit :
>>
>> There is a tool named ddrescue that can continue to read even if you
>> get block errors, and if you save it to a file, and once you have the
>> file, try to play it with mplayer to see if there is any hope at all to
>> get the mp3 files back.
>
> Will mplayer be happy to be fed with a filesystem image ? If not, you
> can try to recover files from the filesystem image with photorec, which
> is part of the testdisk package.


These look useful, but first I need to get the dvd drive to physically
read something. ATM its just spins a while, then bombs out with a "No
such file or directory" error.

I'll play around with ddrescue, but I don't thing it'll do much until I
can figure out how to read /something/ on the duff disk.

Cheers.

--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

Responding to Mike Jones:

> Responding to Pascal Hambourg:
>
>> Hello,
>>
>> bb a écrit :
>>>
>>> There is a tool named ddrescue that can continue to read even if you
>>> get block errors, and if you save it to a file, and once you have the
>>> file, try to play it with mplayer to see if there is any hope at all
>>> to get the mp3 files back.
>>
>> Will mplayer be happy to be fed with a filesystem image ? If not, you
>> can try to recover files from the filesystem image with photorec, which
>> is part of the testdisk package.
>
>
> These look useful, but first I need to get the dvd drive to physically
> read something. ATM its just spins a while, then bombs out with a "No
> such file or directory" error.
>
> I'll play around with ddrescue, but I don't thing it'll do much until I
> can figure out how to read /something/ on the duff disk.
>
> Cheers.



Update: Just tried mount -t iso9660 /dev/sr0 /home/user/temp

and got 'mount: /dev/sr0: can't read superblock' as the error.

This is a different error to the others, so maybe the superblock is
barfed on the cdrom disk? If so, maybe its beyond recovery?

Its a read:write disk, so there may be a trick yet?

--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

On 2009-11-02, Mike Jones <Not@Arizona.Bay> wrote:
> Responding to Pascal Hambourg:
>
>> Hello,
>>
>> bb a écrit :
>>>
>>> There is a tool named ddrescue that can continue to read even if you
>>> get block errors, and if you save it to a file, and once you have the
>>> file, try to play it with mplayer to see if there is any hope at all to
>>> get the mp3 files back.
>>
>> Will mplayer be happy to be fed with a filesystem image ? If not, you
>> can try to recover files from the filesystem image with photorec, which
>> is part of the testdisk package.
>
>
> These look useful, but first I need to get the dvd drive to physically
> read something. ATM its just spins a while, then bombs out with a "No
> such file or directory" error.

This is attempt to read a filesystem.
Now, ddrescue is different (as is dd)
It doesn't care about file systems, it reads the device.

I have rescued some really badly broken ones with ddrescue.
This takes time (hours or days) to accomplish but something will be
rescued, that's for sure.

You may be better off with creating a raw device and try to read from
that, it's worked here.

Here's one set of instructions:
http://ask.metafilter.com/68265/But-...little-scratch

>
> I'll play around with ddrescue, but I don't thing it'll do much until I
> can figure out how to read /something/ on the duff disk.

Your "no such file" is telling me that you haven't tried on device level.
Try ddrescue, it's worth it.

Vahis
--
"Sunrise 7:48am (EET), sunset 4:18pm (EET) at Espoo, Finland (8:30 hours daylight)"
http://waxborg.servepics.com
Linux 2.6.25.20-0.5-default #1 SMP 2009-08-14 01:48:11 +0200 x86_64
8:10pm up 3 days 1:11, 11 users, load average: 0.20, 0.17, 0.18

On 2009-11-02, Mike Jones <Not@Arizona.Bay> wrote:
>
> Update: Just tried mount -t iso9660 /dev/sr0 /home/user/temp
>
> and got 'mount: /dev/sr0: can't read superblock' as the error.

A broken disk can hardly be mounted.
It must be read on device level, unmounted.
>
> This is a different error to the others, so maybe the superblock is
> barfed on the cdrom disk? If so, maybe its beyond recovery?
>
> Its a read:write disk, so there may be a trick yet?
>
I recommend ddrescue warmly.

Vahis
--
"Sunrise 7:48am (EET), sunset 4:18pm (EET) at Espoo, Finland (8:30 hours daylight)"
http://waxborg.servepics.com
Linux 2.6.25.20-0.5-default #1 SMP 2009-08-14 01:48:11 +0200 x86_64
8:22pm up 3 days 1:23, 11 users, load average: 0.14, 0.17, 0.16

Mike Jones wrote:
> Responding to philo:
>
>> Mike Jones wrote:
>>> I burned a CDROM a short while back, and now can't get the **** thing
>>> to mount (even though it would have been checked as OK prior to
>>> storage). As its got data on it that is no longer available from
>>> source, I'm wondering if anybody has any favorite tricks they've used
>>> to force a mount.
>>>
>>> Its a cheapo Memorex thing from some supermarket, and the data was
>>> originally on an ext2 file system. The data is a collection of MP3
>>> lectures, and was burned as data (not as an audioCD) to this CDROM
>>> using Brasero on a Zenwalk-5.2 OS.
>>>
>>> I've tried the usual "auto" and "ext2" mount options, and the "-s"
>>> sloppy mount flag, but the best I can manage is a lot of disk spinning,
>>> followed by a report that the resource is read only (its not) and a
>>> mount screen report about "No such file or directory" available.
>>>
>>> Just to be sure I'd actually managed a burn in the first place, I
>>> dropped the disk into a burn process in XFburn (the app I'm currently
>>> using on Slackware) and, as expected, got a report that the CDROM disk
>>> was full.
>>>
>>> There is no visible evidence of damage on the disk itself. Its shiney
>>> new.
>>>
>>> I'm open to suggestions about now. Clues anyone?
>>>
>>>
>>
>> try it on another machine
>
>
> Done that already.
>
>



there's a windows utility call iso buster that I've used with good results.
don't know if there is a Linux equiv

On 2009-11-02, Mike Jones <Not@Arizona.Bay> wrote:

> I burned a CDROM a short while back, and now can't get the **** thing to
> mount (even though it would have been checked as OK prior to storage). As
> its got data on it that is no longer available from source, I'm wondering
> if anybody has any favorite tricks they've used to force a mount.

Once recovered one by forcing the drive to read it at a slow rate (1x speed
or 2x speed).

If I'm not mistaken, I did that by using hdparm:

hdparm -E 2 /dev/cdrom

Mind that you try your reading on a CD-ROM drive, not a DVD drive. Unless it
was burned on a DVD burner, in which case you use that one.

Min CD-ROM speed for a DVD device is 8x, of course.


Good luck.


--
Any time things appear to be going better, you have overlooked
something.

Responding to Rikishi42:

> On 2009-11-02, Mike Jones <Not@Arizona.Bay> wrote:
>
>> I burned a CDROM a short while back, and now can't get the **** thing
>> to mount (even though it would have been checked as OK prior to
>> storage). As its got data on it that is no longer available from
>> source, I'm wondering if anybody has any favorite tricks they've used
>> to force a mount.
>
> Once recovered one by forcing the drive to read it at a slow rate (1x
> speed or 2x speed).
>
> If I'm not mistaken, I did that by using hdparm:
>
> hdparm -E 2 /dev/cdrom
>
> Mind that you try your reading on a CD-ROM drive, not a DVD drive.
> Unless it was burned on a DVD burner, in which case you use that one.
>
> Min CD-ROM speed for a DVD device is 8x, of course.
>
>
> Good luck.



Hmmm. Interesting ideas there. I shall investigate. Thanks.


--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/

Responding to philo:

> Mike Jones wrote:
>> Responding to philo:
>>
>>> Mike Jones wrote:
>>>> I burned a CDROM a short while back, and now can't get the **** thing
>>>> to mount (even though it would have been checked as OK prior to
>>>> storage). As its got data on it that is no longer available from
>>>> source, I'm wondering if anybody has any favorite tricks they've used
>>>> to force a mount.
>>>>
>>>> Its a cheapo Memorex thing from some supermarket, and the data was
>>>> originally on an ext2 file system. The data is a collection of MP3
>>>> lectures, and was burned as data (not as an audioCD) to this CDROM
>>>> using Brasero on a Zenwalk-5.2 OS.
>>>>
>>>> I've tried the usual "auto" and "ext2" mount options, and the "-s"
>>>> sloppy mount flag, but the best I can manage is a lot of disk
>>>> spinning, followed by a report that the resource is read only (its
>>>> not) and a mount screen report about "No such file or directory"
>>>> available.
>>>>
>>>> Just to be sure I'd actually managed a burn in the first place, I
>>>> dropped the disk into a burn process in XFburn (the app I'm currently
>>>> using on Slackware) and, as expected, got a report that the CDROM
>>>> disk was full.
>>>>
>>>> There is no visible evidence of damage on the disk itself. Its shiney
>>>> new.
>>>>
>>>> I'm open to suggestions about now. Clues anyone?
>>>>
>>>>
>>>>
>>> try it on another machine
>>
>>
>> Done that already.
>>
>>
>>
>
>
> there's a windows utility call iso buster that I've used with good
> results. don't know if there is a Linux equiv


Doubtless. It might be a combination of things called in one commandline
though. I guess I'm going to end up learning it. ;\


--
*===( http://www.400monkeys.com/God/
*===( http://principiadiscordia.com/
*===( http://www.slackware.com/