mkudffs and drive state

Hello list, I walk trow the Internet to see the state of udf on Linx, I see 
udftools, and pktcdvd driver includded in mainline kernel.

In my experiments I use CD-RW CMC 24x, Sony 4X+RW media, Sony 1X-RW media, and 
Mellody 2.5+RW Media, with all media I can use udffs, but trying to repeat 
the proces not always work, and External FireWire/USB2.0 case with a Pioneer 
DVR110D [1.22].

My first try was wonderful, Just I choose one DVD+RW put them onto my DVR110D 
and just format with mkudffs cause dvd+rw are true random writable (pktcdvd 
not needed).

When I try to repeat the experiment even with the non anymore virgin disk, the 
experiments goes worst than I wish :(, errors on some sectors, segfaults of 
mkudffs, or just cannot write, read only media, diferents errors with 
cdrwtool and more, the disk are clean of dust and have no scratches of course 
and was virgings the 1st time.

For example I got the error "trying to change multiple type of extents" many 
times, and I'm sure dbus, ivman or hald are really dead, the error looks like 
trying to open the /dev/sr0, is being read only, cause is happening when 
mkudffs try to open /dev/sr0 for O_RDRW flag, too weird.

This is not directly related to packet writing sorry, but someone knows why 
the virgin media can be oppened for O_RDRW, and why not quick erased media 
can O_RDRW again?.

Well, then loading pktcdvd driver and making pktsetup any /dev/sr0 I got the 
special device /dev/pktcdvd/pktcdvd0 that can be used for format, but 
sometimes not allways, for example I was being forced to write the udf fs 
over a loop file to write with growisofs to allow mkudffs to format again +rw 
or -rw media.

There is any working proper way to setup a media, or always is to be randomly 
weird, at least the disc is completely virgin of course.

regards.
-- 
Gustavo Guillermo Pérez
Compunauta uLinux
www.compunauta.com