Date: Fri, 4 Dec 2009 21:34:13 -0800 (PST) From: James Phillips <anti_spam256@yahoo.ca> To: Al Plant <noc@hdk5.net> Cc: freebsd-questions@freebsd.org Subject: Re: [Solved] Having problems burning a DVD Message-ID: <853320.94407.qm@web65511.mail.ac4.yahoo.com> In-Reply-To: <4B19627F.7020908@hdk5.net>
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--- On Fri, 12/4/09, Al Plant <noc@hdk5.net> wrote:
> From: Al Plant <noc@hdk5.net>
> Subject: Re: [Solved] Having problems burning a DVD
> To: "James Phillips" <anti_spam256@yahoo.ca>
> Cc: freebsd-questions@freebsd.org
> Received: Friday, December 4, 2009, 12:26 PM
> James Phillips wrote:
<SNIP!>
> > I noticed that the hash does not match the ISO file.
> Is that normal for DVDs? For CD images I often get the md5
> hash to match.
<SNIP!>
> Aloha JP,
>
> This is what I use on FreeBSD from the command line to burn
> DVD's.
> I have used it on FreeBSD 8* for a while. (Simple and it
> works.)-
>
Yes, I got that far, hence the [Solved] tag.
I was mainly concerned that I made a mess of my /boot/loader.conf
I am also a little concerned that the DVD only reads a ~1.5MB/s (a little faster than 1x), but it appears to work. Burning happened at ~7x according to growisofs.
>
> Then> Run # growisofs -dvd-compat -Z
> dev/cd0=/usr/home/alp/FreeBSD_7/7.2-RELEASE-p1-i386-disc1.iso
> (all on one line)
>
> Then> Use cd0 as a DVD burner and make the DVD-R
>
> I tested the DVD on a spare box and it installed just
> fine.
>
I found out why the checksum didn't match: the "-dvd-compat" option adds 6 2048 byte sectors of zeros to the end of the disk.
So, I was able to verify the md5 sum by reading only the number of sectors present in the iso file.
$ dd if=/dev/dvd bs=2048 count=996586 | md5
I noticed the size discrepancy while doing a binary search using the iseek (dd)(and count) argument(s) to narrow down the location of the corruption.
Regards,
James Phillips
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