Re: Announcing cdrskin-0.4.4

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

i wrote:
> > Your operating system seems to be a kernel 2.4.
Giulio Orsero wrote:
> 2.4.33 kernel.org
> $ dd if=/dev/zero of=/dev/scd0 bs=32k
> dd: opening `/dev/scd0': Read-only file system
> It works ok on DVD-RAM media.

I think it is less intrusive to work with a
burn program than to upgrade the kernel
which probably regards BD-RE as fat data CD-ROM.

So let's see whether we can get cdrskin-0.4.5
to success.


I read MMC-5 for disabling write error detection
in order to get full speed.
That topic is scattered all over the document.

Two possible paths of exploration appear for now:

- Format the media with certification and use
  WRITE12 with streaming bit.
  This would give the drive chances to skip the
  error detection reading and it would give it a
  hint that speed is critical.

- Format the media with no spare area.
  This would take away the chance to correct errors
  and maybe disable the costly detection of errors.
  That would be format 31h.

Did you already post the format capacities
section from the output of  dvd+rw-mediainfo ?
With a DVD-RAM that looks like:
  READ FORMAT CAPACITIES:
    formatted:             2236704*2048=4580769792
    00h(800):              2236704*2048=4580769792
    00h(800):              2295072*2048=4700307456
    01h(800):              2226976*2048=4560846848
    01h(800):              2217248*2048=4540923904

I would be interested in the availability of formats
30h(...) and 31h(...)

The path with streaming bit on certified media can
possibly be explored with DVD-RAM. Formatting without
spare area is not described for DVD-RAM but might hide
behind this format descriptor
    00h(800):              2295072*2048=4700307456
which offers a suspiciously large payload capacity.


Have a nice day :)

Thomas