Re: Non-RW media; WORM hopes

RB wrote:
> On 6/12/07, Phillip Susi <[email protected]> wrote:
>> The media must be formatted for packet writing mode and you must use a
>> block size equal to the packet size ( 32k by default ).
> 
> I wish I weren't so dense.  I thought the default packet size for
> optical media was 2k - where do you get 32k?

No, the sector size is 2k.  The default packet size that cdrwtool 
formats the track with is 32k.  I uploaded some patches to Ubuntu 
documenting the hidden parameter to change the packet size, and fixing a 
bug that prevented sizes other than 32k from working.  If you download 
the source package from packages.ubuntu.com, you will find these patches 
in the debian/dpatch directory.  Larger packets allow you to use more of 
the disk, smaller ones require that you write less at a time.

> Regardless, I can't get any of the UDF formatting tools to do anything
> anyway 'mkudffs -r 0x0150 --media-type=worm /dev/hdc 359845' fails
> silently with EROFS and EBADF; 'cdrwtool -d /dev/hdd -u 359845' runs a
> bit, then fails with 'bad sector' IDE errors.
> 
> Is the comment about formatting the media an esoteric one or do you
> know something about one of the tools I'm unaware of?

Again, you can not put a udf filesystem on it.  You need to use cdrwtool 
  to only format the track, which I believe was the -m option.

Once the track is formatted, you should be able to write directly to it 
with dd using 32kb blocks.