Re: [Bug-xorriso] Formating of DVD-RAM fails

[Thomas Schmitt]

Hi,

> libburn : FAILURE : Asynchronous SCSI error : See MMC specs: Sense Key 3 
> "Medium error", ASC 32 ASCQ 00.

That's
  3 32 00 NO DEFECT SPARE LOCATION AVAILABLE

Seems that the DVD-RAM has a bad spot and the drive-internal
formatting procedure bails out because it cannot replace it.


> Any chance to use this discs?

You will need to allow the DVD-RAM to have Spare Area in
order to perform Defect Management.
(Actually you need a different DVD-RAM medium. This one
is questionable.)


>  I want to use them like DVD+RWs with
> session writing not as blockdevice, the standard way DVD-RAMs are
> normally used. 

Get DVD+RW instead. They are much better than DVD-RAM.
E.g. you get three or five for the price of one DVD-RAM,
they are faster, they are more reliable, they are larger.

That said, both DVD+RW and DVD-RAM on hardware level always
show one single readable and writable track and session.
You do not get a sequential medium when you format a DVD-RAM
or a BD-RE to zero Spare.
The only medium which can hop between sequential and
overwritable is DVD-RW. It can be formatted to be
overwritable and de-formatted to be sequential.

xorriso emulates multi-session on overwritables by chaining
ISO filesystems. The original idea stems from growisofs. But
that program overwrites the superblock of the first session
when a new session gets added. So it loses the history.
xorriso saves a copy and thus can show the whole chain of
pseudo-sessions.


Have a nice day :)

Thomas