Re: Reading Windows CD on Linux 2.4.6

[Wojtek Pilorz]

On Mon, 17 Sep 2001, Bruce Blinn wrote:

> Date: Mon, 17 Sep 2001 15:28:42 -0700
> From: Bruce Blinn <[e-mail]>
> To: Alan Cox <[e-mail]>
> Cc: [e-mail],
>      Masoud Sharbiani <[e-mail]>,
>      [e-mail]
> Subject: Re: Reading Windows CD on Linux 2.4.6
> 
> Alan Cox wrote:
> > 
> > > Here are the results of the methods that were suggested for producing a
> > > CD image.  They all seem to fail at the same place because the resulting
> > > file is the same size.
> > >
> > >       # dd if=/dev/cdrom of=/tmp/cd1.iso
> > >       dd: /dev/cdrom: Input/output error
> > >       1440+0 records in
> > >       1440+0 records out
> > 
> > Bad CD image - or that is all the data on it. If its bad blocks you can tell
> > dd to continue past bad blocks and pad them with zero - handy for rescueing
> > uncompressed tape backups
> 
> I do not think the disk is missing data or that there are any bad
> blocks.  The reason I say this is because I can access every file on the
> disk when the CD is mounted as an iso9660 file system on a 2.2.19
> kernel.  I compared the files with the originals and they are identical.
Maybe it is not a single session disk?

Could you try
cdrecord -toc dev=x,y
where x,y are numbers returned for your SCSI (either native or emulated)
device by
 cdrecord -scanbus

I have never played with multisession disks so far, but I don't think dd
could read anything more than the first track ...

> 
> The only reason I found out dd would not copy the disk is because Masoud
> asked for an image.
> I tried using dd to copy a much larger CD (150 Mb) and it fails at the
> same place and the resulting file is the same size (737280 bytes).  So
> it fails long before the end of the data.
This would again make me suspect Win software does not produce 
single-session disks ...

> 
> By the way, dd works fine when copying other CDs that were not created
> under Windows.
> 
> Thanks,
> Bruce
> 
Best regards,

Wojtek