Re: Wheezy amd64 XFCE how to burn Blu-Ray (BD-R )discs?
Hi,
Gary Dale wrote:
> I wasn't striving for absolute accuracy but rather to give
> the OP the flavour of the issue.
There are too many urban legends around about optical media.
The whole topic is somewhat complicated but not by far as weird
as some discussions in the web would suggest.
> I use BD-RE for automated backups where defect management
> is nice to have and where the ability to rewrite individual
> files is also important.
This is useful if the files are small or if the data get written
at a low speed.
The problems arise when you want to fill a whole BD.
Defect Management appears nice in theory. But in practice it does
not work well. Comparison after nearly five years of experience
tells me that the chance for a flawlessly readable medium is better
if i disable Defect Management.
> Using E to indicate that you can erase it doesn't really capture
> the essence that you can overwrite existing sectors with new data.
Yeah. Funnily the MMC standard uses the term "erase" for blanking
CD-RW or DVD-RW. The BD-RE media belong to the "overwritable" types.
> Both BD-R and BD-RE use the + disc track/sector structure that
> was originally in DVD-RAM and adopted by DVD+,
Urm, no.
BD-R and DVD+R have a multi-track structure. BD-RE and DVD-RAM
have only one track that is overwritable.
BD-R can be formatted to appear as overwritable (POW). Each overwritten
block will be replaced by a new one from the pool of unwritten ones. But
since already Defect Management works poorly, POW can only be worse.
> I think of BD as super DVD-RAM.
For BD-RE this is ok. And they do work quite reliably. Other than DVD-RAM.
Nevertheless i use Defect Management only for the first few MB,
where i write multi-session emulation and ISO 9660 directories.
For the bulk of file content data i disable it in order to get full
nominal speed of the medium.
Have a nice day :)
Thomas
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