Re: [slightly OT] dvdrecord 0.3.1 -- and yes, dev=/dev/cdrom works ;)

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

>> > > And what about DVD-RAM drives? Any plans to support those?
>> > My [limited] understanding of DVD-RAM drives was that they are
>> > basically removable block devices... you wouldn't need a recording
>> > program for that, you'd use it like a floppy.
>> Same goes for DVD+RW. One may want to use it in conjunction with pktcdvd
>> for aligning and command queueing/iosched reasons.
>
> Can I mount a friendly challenge to that idea?
>
I win, reiserfs on a dvd+rw:
  http://jengelh.hopto.org/GFX/dvdrw_r3mnt.jpg

> I had presumed that these are to give the drive
> something big to key its read/write operations on.  Nice, except I don't think
> the media is compatible with a regular DVD drive.
>
Yes. A 650 MB *CD*-RW (DVD-RW too?) formatted in packet mode only has like
500-something megabytes to allow for the sort of seeks required.
On DVD+RW, you get the full 4.3 GB (4.7 gB) AFAICS.

> DVD+RW, on the other hand, I just thought was a different surface technology
> (more expensive, higher quality) than DVD-RW.  There is nothing to help with
> the lead-in/lead-out problem that is why you have several megabytes of lead-in
> and lead-out per session on a multi-session disc.
>
> But maybe I'm wrong here... if I could use a DVD+RW like a DVD-RAM I'd be very
> happy indeed.
>
> Sam.
>
>

Jan Engelhardt
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