Hi, j t: > just found http://fy.chalmers.se/~appro/linux/DVD+RW/-RW/ which > explains the same subject, I think)
Yep. This puts some emphasis on readability by entertainment hardware. Video players, game consoles. Cool, i did not know the paragraph about DVD-R Dual Layer yet. Gives me something to search for in the MMC specs. We got a zoo of media and many of them can be written in more than one way. DVD-RW has three ways to write (DAO, Incremental, Overwrite) and four media states (fully blank, blanked fast, appendable, overwriteable) which allow one or two of those ways. Joerg Schilling: > You should try to use cdrecord blank=all or cdrecord blank=all on the medium > in order to bring it back into usability if it was used by growisofs before. > > Later, when using cdrecord for writing, it is sufficient to use > cdrecord blank=fast to make it usable again. > ... > A full blank is only needed if the media was written in packet mode > before or if it was formatted. Are you sure that blank=all is really needed for deformatting ? Since cdrecord writes in DAO mode it should suffice to blank fast. Even if the media was formatted before. Contemporary growisofs does not format DVD-RW by default. It leaves sequential DVD-R[W] appendable by default, which makes them unusable for DAO. But a simple blank=fast should suffice. If option -dvd-compat is given, then the media get closed and thus unusable for any writing until they get blanked. If -dvd-compat is given on blank media then DAO is used. cdrecord -sao does about the same as growisofs -dvd-compat -Z The erase-my-bytes job with cdrecord would look like size=2297888 cdrecord -v dev=ATA:1,0,0 blank=fast dd if=/dev/zero bs=2048 count=$size | \ cdrecord -v dev=ATA:1,0,0 -sao tsize="$size"s - Possibly it is wise not to use the full announced capacity but a few sectors less. Like: size=2297000 I just tested with an overwriteable DVD-RW and cdrecord-2.01.01a23 . Only failure is that i cannot combine the blank run with the write run: cdrecord -v dev=0,0,0 blank=fast -sao tsize="$size"s - yields WARNING: Phys disk size 2146400 differs from rzone size 0! Prerecorded disk? WARNING: Phys start: 196608 Phys end 2343007 cdrecord: Data will not fit on any disk. cdrecord: Cannot write CD's >= 100 minutes. If i do blanking and writing in two runs then it works: Blanking time: 46.793s Writing time: 842.177s Same result with an appendable sequential DVD-RW. You should make some new tests. > Well, cdrecord will soon have it's 10th DVD writing anniversary ;-) Congrats :) Since one year we are ageing at the same speed. > dev=ATA:1,0,0 will not work. ATA:1,1,0 as /dev/hdd works fine for me on a SuSE 9.3 with four scannable drives: /dev/s[rg][01] , /dev/hd[cd] of which two are burners. me: > > unformatted state. -blank without "=full" does the same as > > cdrecord blank=fast. Joerg Schilling: > It is most unlikely that dvd+rw-format -blank=full does the same > as cdrecord blank=fast. This would be counter-intuitive. I wrote: _without_ "=full". dvd+rw-format -blank=full is like cdrecord blank=all dvd+rw-format -blank is like cdrecord blank=fast > DVD-RWs last a very long time if you use the right software, > e.g. cdrecord. Not with my DVD drives. 4x DVD-RW die with all programs and if they are dead then nothing can revive them. The software is not decisive. I went nuts when i developed libburn's sequential DVD-RW support and lost two media. So i made expensive tests and lost one media each with growisofs and with cdrecord by exactly the same sympthoms. That soothed me. Have a nice day :) Thomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]