Re: PATCH: cdrecord: avoiding scsi device numbering for ide devices

Matthias Andree
2004-08-11T00:25:02Z

On Tue, 10 Aug 2004, Gene Heskett wrote:

[burnproof decreases CD quality]
> How so Joerg? Making a blanket statement such as this requires a good
> proof example IMO. You not are giving one.

The switch from read mode to write mode (i. e. find end of data,
increase LASER power to write and pick up writing) takes some time
(order of magnitude: µs) which means some pits/lands aren't right during
that phase. How many pits/lands are broken break depends on hard- and
firmware, write speed and model and for CAV the radial position on the
disc. Fast writers will need to reach a linear velocity around 60 m/s
(216 km/h); one µs time to ramp up LASER power from read to write level
there means up to 60 µm lost.

How far good improvements in the hard- and firmware have allowed to
reduce that gap is beyond my current knowledge. Some figures are posted
at: http://www.digital-sanyo.com/BURN-Proof/tips/No1.html
http://www.digital-sanyo.com/BURN-Proof/tips/No2.html

--
Matthias Andree

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