From george at galis.org  Fri May 11 14:57:52 2007
From: george at galis.org (George Georgalis)
Date: Fri May 11 14:57:57 2007
Subject: [macosx-unix] getting at the cd device file, and eject
Message-ID: <20070511185752.GF22951@run.galis.org>

So I have this nice audio cd in my powerbook.

when I tried to read the /dev/disk1 file with dd (it
was auto mounted, and I used df to determine the
device node), I got
dd: /dev/disk1: Resource busy
I thought that was odd for read only media, but I
did sudo umount /dev/disk1 and tried to read it
again with dd.

same error, hosed system required reboot.

So, how do I use dd to read a cdrom? eg to make an
iso file? and is there a way other than reboot to
fix a system (or at least eject) with a umounted
cdrom?

// George


-- 
George Georgalis, information systems scientist <IXOYE><
From compustretch at gmail.com  Fri May 11 16:31:09 2007
From: compustretch at gmail.com (forest  mars)
Date: Fri May 11 16:31:13 2007
Subject: [macosx-unix] getting at the cd device file, and eject
In-Reply-To: <20070511185752.GF22951@run.galis.org>
References: <20070511185752.GF22951@run.galis.org>
Message-ID: <c2f754300705111331n570df403v4fb72790dbad2178@mail.gmail.com>

On 5/11/07, George Georgalis <george@galis.org> wrote:
>
> So I have this nice audio cd in my powerbook.
>
> So, how do I use dd to read a cdrom? eg to make an
> iso file? and is there a way other than reboot to
> fix a system (or at least eject) with a umounted
> cdrom?



thems 2 different questions of course:

1. "dd if=/dev/disk1 of=myfile.iso"  works for me. you could try
specifically defining the bs, though you shouldn't have to.

2.  resource busy would seem to be the real issue here, assuming that /disk1
works in every other respect, but locks up when you try to dd it?

did you try      "diskutil info /volumes/disk1"   ?

Just starting with the obvious.
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From: "George Georgalis" <george@galis.org>
Date: May 11, 2007 2:57:52 PM EDT
To: macosx-unix@lesmuug.org
Subject: [macosx-unix] getting at the cd device file, and eject


So I have this nice audio cd in my powerbook.

when I tried to read the /dev/disk1 file with dd (it
was auto mounted, and I used df to determine the
device node), I got
dd: /dev/disk1: Resource busy
I thought that was odd for read only media, but I
did sudo umount /dev/disk1 and tried to read it
again with dd.

same error, hosed system required reboot.

So, how do I use dd to read a cdrom? eg to make an
iso file? and is there a way other than reboot to
fix a system (or at least eject) with a umounted
cdrom?

// George


-- 
George Georgalis, information systems scientist <IXOYE><
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