Date: Sun, 14 Mar 2010 10:08:48 +0100 From: Roland Smith <rsmith@xs4all.nl> To: Aiza <aiza21@comclark.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: how to use cdrecord Message-ID: <20100314090848.GA9037@slackbox.erewhon.net> In-Reply-To: <4B9C5C57.6060800@comclark.com> References: <4B9C3DFB.7010307@comclark.com> <alpine.BSF.2.00.1003132231470.79286@tripel.monochrome.org> <4B9C5C57.6060800@comclark.com>
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On Sun, Mar 14, 2010 at 11:47:35AM +0800, Aiza wrote:
> Chris Hill wrote:
> > On Sun, 14 Mar 2010, Aiza wrote:
> >=20
> > [snip]
> >> tried cdrecord -v speed=3D2 dev=3Dacd0 blank=3Dfast
> >> gives this error "Open by devname not supported on this OS.
> >>
> >> What device am i to use?
> >=20
> > cdrecord wants to see your ATA burner as a SCSI device, so you'd use
> > cdrecord dev=3D1,0,0 ...
> > The numbers after dev=3D depend on where your burner is; find it using
> > cdrecord -scanbus
> >=20
> > HTH.
> >=20
> cdrecord -scanbus gives a error. Invalid argument. Camiocommand ioctl=20
> failed, can not open scsi driver
You need SCSI emulation for your burner in your kernel. Specifically, you n=
eed
to recompile your kernel with the following devices in its configuration fi=
le:
device atapicam # emulate ATAPI devices as SCSI ditto v=
ia CAM
# needs CAM to be present (scbus & pass)
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
device da # Direct Access (disks)
device cd # CD
device pass # Passthrough device (direct SCSI acces=
s)
See the manual pages atapicam(4), scbus(4), cd(4) and pass(4).
It could be that these devices are also available as modules, but I've alwa=
ys
build a custom kernel, so I don't know about that. The manual pages don't s=
ay
that they are available as modules, so I'm inclined to say they are not.
After rebuilding the kernel, which you'll find documented in Chapter 8 of t=
he
Handbook, you also need to give your user-id write access to the right
devices. I have done that by creating a group "cdrom", to which I've added =
my
user-id (with 'pw groupmod -m'). Then I've put the following lines in my
/etc/devfs.conf:
# Give members of group cdrom access to the CD/DVD-ROM and DVD+RW via t=
he
# SCSI interface
own xpt0 root:cdrom
perm xpt0 0660
own cd0 root:cdrom
perm cd0 0660
own cd1 root:cdrom
perm cd1 0660
link cd1 cdrom
link cd1 dvd
Since I've got both a burner and a regular DVD player in my machine, you see
two cd devices but only one xpt device.
Additionally, the following has been added to my standard ruleset in /etc/d=
evfs.rules:
[slackbox=3D10]
add path 'pass*' mode 0660 group cdrom
And in /etc/rc.conf the following is added;
devfs_system_ruleset=3D"slackbox"
I've put the pass device in devfs.rules because it will attach to every SCSI
device that attaches to the system, _even if they are added after booting_
like e.g. USB disks used with the da(4) driver.
Hope this helps.
Roland
--=20
R.F.Smith http://www.xs4all.nl/~rsmith/
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