Re: Problems when writing DVDs with growisofs
From: Andy Polyakov <appro@fy.chalmers.se>
Subject: Re: Problems when writing DVDs with growisofs
Date: Tue, 11 Jul 2006 18:39:58 +0200
> > What data transferrate would you exspect while writing to a DVDRAM?
>
> What does media case say? 3x? 2x? But no, not that much...
Hmmmm...the media case is a plastic box witn a slider. Inside is a
two sided DVDRAM. The writing on the slider says:
Verbatim DVD-RAM 9.4GB - 4.7GB/side rewriteable TYPE A
below that there is the DVD-logo with "RAM RAM 4.7" added
Beside "SIDE A" and "SIDE B" there nothing more on the media.
I can removed the media from the box for writing.
> > I know, that is slower than DVD+/-RW, since it does verify the data,
>
> Keep in mind that data written to DVD-RAM is verified immediately upon
> write only when explicitly asked for with WRITE AND VERIFY
> command[*].
...Am I right here ?:"When writing to a DVDRAM with growisofs I will
get a filesystem identical to that of a DVD: udf or iso9660."
> Otherwise data verification is performed upon later playback and if
> block smells deteriorated, then the data is transparently moved to spare
> area. It should also be noted that advertised velocity of 2-3x can only
> be observed when you switch off defect control system [or bypass it be
> means of "streaming recording"[**]]. So that as defect control is
> [presumably] on by default, you're likely to observe lower speeds, 1x if
> not less, so that an order of one hour magnitude for 4GB should be
> reasonable...
>
> [*] growisofs can do this with -use-the-force-luke=wrvfy, also note that
> Linux kernel does *not* do anything of that sort;
> [**] for technically minded "streaming recording" refers to WRITE(12)
> with "streaming" bit set;
>
> > but with my setup it takes hours to write 4GB...
> >
> > Hardware: LG 4163B (A106 firmware, newest stable)
> > Software: Linux 2.6.17.4 (newest stable)
> >
> > formatted with udf (udftools)
> > Mounted directly (no pktcdvd...)
>
> I wouldn't put so much faith to Linux UDF write performance. Use ext2 or
> stick to growisofs:-) One way or another it hardly have anything to do
> with pktcdvd. A.
I heard, that using ext2 or such will kill DVDRAM soon, since there
are sectors (blocks? or whatever it is named ... sorry, I am not a
native English speaker...) constantly written to, so they will die
to soon since there max. write count has been reached.
[ ] true ?
[ ] false ?
Thanks a lot for your help in advance, Andy ! :)
Keep hacking!
mcc
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