Re: wodim and speed setting

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  On 10/14/2010 02:26 AM, Tim wrote:
> On Wed, 2010-10-13 at 12:05 -0400, Paul Cartwright wrote:
>> I normlly burn with speed=4. but
> Tangential question:  Are you guys using media that supports such slow
> speeds?  And, if you are not, and if you could previously burn slower,
> that might be down to burning software overriding the data that the disc
> says.
>
> I say this because I've seen, in at least in some DVD media, discs
> reporting that they support only a few speeds, none of which was 1x.
> Which, theoretically, would preclude reliably using them in standalone
> DVD video recorders, as a straight record TV to DVD is done at single
> speed.  And, I'm sure, a similar situation will exist for CD media.
>
> It's common for the media to report that it can burn at a few specific
> speeds, and you have to hope that some of them match the speeds that
> your burner can run at.
>
> $ dvd+rw-mediainfo /dev/dvd
> INQUIRY:                [HL-DT-ST][DVDRAM GSA-T20N ][WR02]
> GET [CURRENT] CONFIGURATION:
>   Mounted Media:         10h, DVD-ROM
>   Media ID:              MCC 03RG20
>   Current Write Speed:   8.0x1385=11080KB/s
>   Write Speed #0:        8.0x1385=11080KB/s
>   Write Speed #1:        4.0x1385=5540KB/s
>   Speed Descriptor#0:    02/2285887 R@xxxxxxxx=2292KB/s W@xxxxxxxx=11080KB/s
>   Speed Descriptor#1:    02/2285887 R@xxxxxxxx=2292KB/s W@xxxxxxxx=5540KB/s
>
> The above example is from a Verbatim DVD-R disc.  According to the disc,
> itself, it can *only* be written at 8x or 4x.  I don't have any other
> writeable media to hand, at the moment, to test.
>
> While you may get away with forcing some media to burn at unsupported
> speeds, I can well imagine there being reliability problems.  Just like
> photography, burning a disc needs the right balance of laser exposure
> power and exposure time.  Some high speed media may be optimised for
> only burning at high speed.
>
Well, here are the SONY media CD speeds:
GET [CURRENT] CONFIGURATION:
  Mounted Media:         1Bh, DVD+R
  Media ID:              SONY/D21
  Current Write Speed:   8.0x1385=11080KB/s
  Write Speed #0:        8.0x1385=11080KB/s
  Write Speed #1:        6.0x1385=8310KB/s
  Write Speed #2:        4.0x1385=5540KB/s
  Write Speed #3:        2.4x1385=3324KB/s

But no matter what speed I specify to wodim,
it jumps to 10x even though the media does not
even support 10x.


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