Re: How to enable a SCSI CD-ROM ?

[Svante Signell]

On Thu, 2011-09-15 at 17:59 +0200, Thomas Schwinge wrote:
> Hi!
> 
> On Thu, 15 Sep 2011 17:17:58 +0200, "Thomas Schmitt" <scdbackup@gmx.net> 
> wrote:
> > Thomas Schwinge:
> > But:
> >   # dd if=/dev/sr0 count=1 bs=2048 skip=16 | strings
> >   dd: opening `/dev/sr0': No such device or address
> 
> >   # devprobe sr0 || echo no
> >   no

mknod /dev/sr0 b 11 0

settrans -cfgap /dev/sr0 /hurd/storeio sr0
But the translator is running:
showtrans /dev/sr0/hurd/blkdev 11 0

# devprobe sr0; echo $?
1
dd if=/dev/sr0 count=1 bs=2048 skip=16 | strings
opening `/dev/sr0': No such device or address

> 
> > man kvm on the hosting Debian amd64 does not tell much about SCSI
> > other than examples how to set up emulated SCSI drives.
> 
> For example, you could boot a GNU/Linux system, and figure out which SCSI
> devices exactly are provided.
> 
> 
> > The message about CD-ROM at hd2 comes even if i submit no -cdrom to kvm.
> > Trying to read it then yields
> >   # dd if=/dev/hd2 count=1 bs=2048 skip=16 | strings 
> >   dd: reading `/dev/hd2': Input/output error
> 
> Yes, in my understanding, that equals an empty CD-ROM tray.  The -cdrom
> option specifies the image to use; if none, the tray is empty.

With the -cdrom option:
dd if=/dev/hd2 count=1 bs=2048 skip=16 | strings

1+0 records in
1+0 records out
CD001
LINUX                           Debian 6.0 h-i386 1             
2048 bytes (2.0 kB) copied, 0 s, Infinity B/s

GENISOIMAGE ISO 9660/HFS FILESYSTEM CREATOR (C) 1993 E.YOUNGDALE (C)
1997-2006 J.PEARSON/J.SCHILLING (C) 2006-2007 CDRKIT TEAM
2011061100420200
2011061100420200
0000000000000000
2011061100420200