------------------ Original ------------------
Date: Wed, Jan 3, 2018 04:52 PM
To: "feng.wang"<feng.wang@aaadisc.com>;
Subject: Re: Could BD-RE disc come back to un-formatted state?
Hi,
> After being formatted, the BD-RE disc is changed to "complete" from "blank"
> status. Could we change the status back to "blank"?
Not regularly. The SCSI/MMC command set for optical media offers no
opportunity to deformat a BD-RE medium. One may only change the size of the
Spare Area.
Said this, i have an old BD burner which can do the trick by accident:
"Optiarc", model "BD RW BD-5300S", firmware "1.04".
If i insert and remove a CD-R medium then it afterwards deformats any BD-RE
medium i give to it and refuses to write them. A power-off-on cycle brings
it back to normal operation.
The affected media have to be formatted again before they can be written.
> According to the
> thread https://lists.debian.org/cdwrite/2010/02/msg00014.html, the
> "dvd+rw-format -blank" command is useless to change the status back to
> "blank".
Indeed. The "-blank" option only applies to DVD-RW media. Those can be
de-formatted from overwritable state to sequential "blank" state (or
erased from sequential states "appendable" or "closed" to "blank").
My program xorriso extends the model of "blank", "appendable", and "closed"
to ISO 9660 sessions on overwritable media like BD-RE. Valid ISO 9660
filesystems do not get overwritten by xorriso unless they get devalidated
by a xorriso "-blank" command.
But that is only a content-orient classification. The hardware state of
such media stays "complete" and no writing can be done before the medium
gets formatted to that state.
What is your use case for which you need to de-format the BD-RE medium ?
Why would a formatted BD-RE not work for this use case ?
Have a nice day :)
Thomas