NOTE: You'll probably only find DVD-burners without a blocksize jumper and therefore
with the new default blocksize predefined to 2048 bytes. Your SPARC's boot DVD drive 
_needs_ to be set to the same blocksize that had been used during burning. For IDE 
drives nothing needs to be done. For certain SCSI DVD-ROM drives you may need to UNset 
the blocksize jumper from "UNIX" or "SUN" to the new (PC-)default == 2048 bytes. 
Make also sure you upgraded to the latest OBP firmware.

I don't know about possible compatibility issues if you burn it on a pc
or even on M$-Windows.
Here is what I did on my SPARCle-500SX via an USB2.0 connected external LG burner:
(Thanks to Joerg Schilling for providing the world with his tools.)

# bunzip2 ./DVD_sun4u_sparcv9__marTux_0.2__Blastwave_CSW_Edition__.iso.bz2
# cdrecord-ProDVD dev=2,0,0 -dao -eject driveropts=burnfree -v ./DVD_sun4u_sparcv9__marTux_0.2__Blastwave_CSW_Edition__.iso 

Installation to hdd is very easy: 
Just partition and label a spare disk, newfs it, installboot the box's appropriate bootblk 
and cpio the slice 5 of the  DVD to a newly created slice of that disk, that's it.
Then either explicitly boot the just created slice explicitly from the ok prompt or create a nvalias 
for ease of use.

If you experience any difficulties or just have a question:
Drop a mail to bochnig AT pool.math.tu-berlin.de
 or               mb1x AT gmx.com


Martin Bochnig