Re: BD-R formatting help

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

> Yes, but with optional +POW twist (see my Blu-ray page).

Plus the code of your tools :))

But doesn't the POW gesture make session 1
unmountable as soon as a further session
is recorded ?
Even on a drive which would recognize and
handle multi-session ?

Accessing older sessions is helpful with
incremental backups.

With overwriteables i write the first session
to LBA 32 and do the patching of LBA 0 to 31
already with that first session. An interested
reader can mount -o sbsector=32 and thus access
session 1 even if LBA 0 to 31 gets overwritten
later.
All other sessions can easily be found by our NWA
rounding (you 16, me 32). They form a nice chain.

I could imagine that this would work with BD-R
POW too.
Hopping over the orphans will make scanning for
sessions more cumbersome. This would apply to
drives which would need your POW patching.
For a multi session drive one would just have
to know that the real session 1 starts at LBA 32
and that the Volume Descriptors at LBA 0 point
to the newest session.


Have a nice day :)

Thomas