[1363] in RedHat Linux List
Re: dd to copy
daemon@ATHENA.MIT.EDU (Donnie Barnes)
Sun Oct 27 23:56:23 1996
To: redhat-list@redhat.com
In-reply-to: Your message of "Sun, 27 Oct 1996 19:35:44 EST."
<199610280035.TAA01188@sojurn.lns.pa.us>
Date: Sun, 27 Oct 1996 23:54:53 -0500
From: Donnie Barnes <djb@redhat.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
[ More proof that using 'dd' to copy a directory tree is silly - deleted. ]
>It might be useful after a mkisofs. Has anyone tried using dd to copy the
>CDROM image to a CDROM writer? This is a case of physical image copy and this
>is where dd shines.
Nope...you can't do that, either. The disk in a CD writer is not
writable media by the kernel. You write to the disk using a
program that interfaces to the generic SCSI device.
Writing to a CD is inversely analagous to scanning using a SCSI
scanner...you can't 'dd' *from* a SCSI Scanner and get an image out.
The different CD writers require different twiddling to write
the image to the disk. Since there isn't a common interface we
use a userspace program to do it. If there *were* a common
interface we could build the functionality of the current writing
program into a device driver and then we *could* write directly to
it.
Right now you need 'cdwrite'...you run it with some options and
with the image as a command line arg and it writes it for you.
--Donnie
--
Donnie Barnes http://www.redhat.com/~djb "Bah."
djb@redhat.com http://www.turner.com/lazarusman/
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