Thomas Schmitt wrote:
I saw a discussion on one of the lists I read about using a DL as though it were two media, and selecting between them. I confess it doesn't seem to solve any problems I have, and I didn't spend much time studying the matter, I may be incorrect about the claims.Hi, me:growisofs claims to be able, cdrecord claims to be able.Joerg Schilling:I cannot speak for growisofs but cdrecord is definitely able to correctly copy DVD-Video with DVD+R/DL and driveropts=layerbreak=#"claims" does not mean i doubt it. I just did not test it myself. Different from other things which i carefully tested with all our wealth of burn programs.I have not yet been able to set the layer break for DVD-R/DL.Reading MMC-5 i am not sure wether it is mandatory to set a layer break explicitely. Paragraph 4.3.5 "DVD-R Dual Layer" talks much about Layer Jump Recording (flip-flopping between layers) but is quite silent about DAO and Incremental.
Paragraph 4.3.7 "DVD+R Dual Layer" is much more detailed about the layer hop. Nevertheless there is a statement which makes me believe it is worth a try to just write to it as to a fat DVD+R.
That seems to work. I did some backups that way, creating big files and just burning them. I believe I used growisofs but I can't be sure after the fact. Reading the data back produced no read errors and a correct md5sum, I did wipe the original and test restore, though. ;-)
In 4.3.7.5 "Recording on DVD+R DL": "The Host is permitted to select a smaller address for this location (See 6.34)." 6.34 describes MMC command BFh SEND DISC STRUCTURE.I guess they mean: 6.34.3.2.4 "Format = 20h: Layer Boundary Information"I would be interested to learn about your opinion and experiences.
-- bill davidsen <davidsen@tmr.com> CTO TMR Associates, Inc Doing interesting things with small computers since 1979