"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> writes: > Matthias Andree wrote: >> "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> writes: >> > Could you set burnfree on by default or give a competent reason to turn >> > off burnfree? >> >> "Burn-proof", "Burnfree", "Just Link", "Seamless Link" or however the >> vendor of the day call their technique to interrupt a streaming write >> and pick up later where they left off always trash a few bits, it's not >> a perfect seamless link - the LASER needs to be switched from reading >> power to writing power, the exact position needs to be used, and this >> isn't trivial. >> >> If I recall correctly, the > first generation of these techniques could >> "cost" near 50 bits, later ones 14 bits, I'm not sure how many bits are >> trashed by current implementations. "bit" here refers to either pit or >> land as the actual physical smallest bit of information. >> >> While the various coding layers of forward error correction codes can >> fix some broken bits, this also means that you are already using >> correcting capability for the "link", and this capability is no longer >> available (already used up) to compensate for scratches, air bubbles in >> the polycarbonate, aging material or just a random error. >> >> For this reason it's best to not use these link capabilities but write a >> continuous stream. I presume that might have been a reason to leave this >> feature off by default. Reducing write speed is often a better >> alternative, and you have a -dummy mode... > > You mean that even if there's no buffer underrun the 50 bits or 14 bits > are always lost in writes around the disk?
These bits are lost each time Burnproof (or whatever its name) kicks in because the buffer has run empty. > Otherwise that could be always left on by default and warn the user when > the disk write is completed that the disk used burnfree at least once > and may not be conformant. Well, you can use /etc/default/cdrecord to that extent. I'm using this on Linux 2.6 (it also sets the buffer size to 64 MB) to achieve that: CDR_DEVICE=plex plex= /dev/hdd -1 64m burnfree nec= /dev/hdc -1 64m burnfree -- Matthias Andree -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
