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SubjectRe: Packet writing issue on 2.6.15.1
iSteve wrote:
> I used cdrecord (via xcdroast) to blank the CDRW and then burn UDF image created
> by mkudffs.
>
> Can I get this mount rainer udf extension work using just this method, and then
> mount it?
>
> Are there any specific mkudffs option that can help me? Or am I absolutely
> obliged to use cdrwtool if I want to even think about using packet writing or
> any other method to mount a CDRW?

cdrecord is just burning the image in dao/tao/sao mode. To use pktcdvd
to read/write the disc on the fly it must be formatted for packet mode
using cdrwtool. If the disc is formatted in MRW mode, then you don't
even need pktcdvd to read/write it, that is supported by the firmware in
the drive. Right now I believe you can use the dvd-rwtools package to
format media in MRW mode, and I plan on adding it as an option to
cdrwtool at some point. See http://fy.chalmers.se/~appro/linux/DVD+RW/
for more info.

The difference between packet mode and MRW mode is that MRW reserves
some of the disc for bad sector sparing, and the drive firmware handles
the reblocking rather than pktcdvd ( it also handles the sector
remapping ). Packet mode was around first and has wider support and
requires less from the drive's firmware, but these days, it seems that
the vast majority of drives support MRW.

I still have not figured out if MRW uses zero loss linking. If it does,
then that would probably make up for the space it reserves for sector
sparing. If it does not, then packet mode with > 32 sector packets will
be more space efficient. I have been planning on experimenting to see
if it is possible to format the disc in packet mode with zero loss
linking on some newer drives. I believe that may be possible in which
case, that will eliminate the space overhead associated with packet mode
entirely.


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