On Wed, 17 Oct 2007, Carlos E. R. wrote:-
>
>The Tuesday 2007-10-16 at 13:18 -0400, Jorge Fábregas wrote:
>
>> Hello guys,
>>
>> I need to split a big tar into a couple of files so I can burn them on DVD+R
>> media. I use Nero for this because it allows me to use UDF as the filesystem
>> (allowing me to burn one BIG file).
>>
>> Considering that a DVD+R holds 4483MB (without overburn),
>
>4700 MB or 4.59 MiB.
Capacity for a DVD+R is 4,700,372,992 bytes[0], 4,482.625MiB or
4.378GiB. A DVD+RDL has (quite) a bit less than double the +R capacity,
holding 8,547,991,552 bytes[0], 8152MB, or 7.961GiB.
<Snip>
>It would also be possible to burn the tar file "raw", meaning
>absolutely no directory overhead:
>
> growisofs -Z /dev/dvd=sometarfile.tar -dvd-compat -speed=8
>
>this way you can burn the 4700 MB.
There is just one slight problem. You can't verify the burn using md5sum
if tar uses the default block size. You need to set tar to use a 32KiB
block size so it matches the default block size growisofs uses.
>Of course, reading it back needs a little trick (use dd, not mount).
Or even just use tar to do it:
tar xf /dev/dvd
tar xzf /dev/dvd
tar xjf /dev/dvd
expand a plain tar, gzipped or bzip2'd tar straight from then DVD.
[0] which the manufacturers round to 2 significant figures which ends up
being the familiar 4.7GB.
[1] again, the manufacturers round to 2 significant figures which ends
up as 8.5GB.
Regards,
David Bolt
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