Text 11961, 141 rader
Skriven 2005-10-24 06:51:00 av George Vandervort (1:382/8)
  Kommentar till text 11958 av Jeff Guerdat (1:123/140)
Ärende: Dvd ?
=============
Hello Jeff!

Monday October 24 2005 06:37, JEFF GUERDAT wrote to JEAN PARROT:

 JG> On 10-23-05, JEAN PARROT said to JEFF GUERDAT:
 JG>
 JG>> 1) I've found DVD-R to be much more problematic than DVD+R.
 JG>> Again, I'm not sure why since it could just be what my drive like
 JG>> but I'm not trying to use el-cheapo discs.  I find that DVD+R
 JG>> writes on-the-fly where DVD-R seems to want to buffer the whole
 JG>> thing and then write. Software/firmware limitation? Don't know.
 JG>
 JP>> I am trying to understand this. Are you using the same SW ? It
 JP>> would be a "mechanical" event in my mind, not SW related. Why would
 JP>> the -R want to buffer the stuff first and the +R burn it in real
 JP>> time ?
 JG>
 JG> That's just it - using the same software to do the same job, the
 JG> process is different.  I didn't time them to see if there was a
 JG> significant difference. In any event, I can't say exactly why the
 JG> difference - I would expect that it's due to the software (Easy Media
 JG> Creator) since the writer just writes what's sent to it but that may
 JG> be driven by a query to the drive and a response that causes the
 JG> software to do something different.


Here is a explanation of how CD/DVD's work
fro, kim Komando's Radio show, weekly newsletter:


=== Cut ===

Deciphering the DVD Muddle...

The fanfare days of CD-RW are over. It is quickly being replaced
by the Digital Video--or Versatile--Disk (DVD) for all the right
reasons. For starters, it is a way to finally use a standard computer
to create a DVD that contains movies and photos viewable by just
about any home DVD player. Because of the size of video files, this
wasn't very feasible with a CD.

While CDs top out at a mere 700 megabytes, DVDs can handle 4.7
gigabytes of data. In movie-speak, this translates to roughly 130
minutes. Some DVDs are double sided; they can store 9.4 GB.

Consider what this means to making important backups. Gone are
the days of spanning data over a handful of CDs. Depending on the
amount of data, one or two DVDs are all you'll need. But if you still
want to burn and read CDs, you can. Most DVD recorders do this, too,
albeit much more slowly than a CD-R or CD-RW drive.

Best of all, the prices of DVD recordable drives now dip into the $200
range, making them more affordable than ever. But all is not rosy
in DVD-land. Make one trip to your favorite computer store and
you see not only competing brands. There are competing formats,
or standards, too. This phenomenon is not all that unusual in
the computer industry.

It happened with 56K modems. And it happened with CD-R drives.
Now, DVD equipment makers cannot seem to agree on standards.
In fact, people can't even agree on what DVD means!

Despite it all, the DVD situation is relatively easy. The right DVD
player depends on three things: whether you want the ability to save
only once or many times per disc, what type of things you want to save
on the disc and who you purchase your computer from.

Let's start with DVD-R and DVD+R drives. Both these drives will only
allow you save or write the disc one time and are well-suited for
video. If you are going to be making backup and video disks, and also
want to burn CDs, look at the DVD-RW and +RW drives. These let you
reuse discs. If you are going to be carrying your backups around and
have no need to burn CDs, a DVD-RAM drive's discs are held in a
cartridge and can be rewritten up to 100,000 times.

If you're buying a computer instead of adding a drive to your current
system, the type of drive you will get depends on who is selling you
the computer. For example, while Dell and Hewlett-Packard use
DVD+RW/R, Gateway and IBM offer DVD-RAM and DVD-R.
Apple offers a DVD-R drive.

Really, the only hard part of this nonsense is making sure your family
room player will handle the disks you create. All players will run the
movies you buy or rent. And many can handle DVD-R and DVD+R.
Check the manufacturers' Web sites to be sure.

Both external and internal DVD recording units are available. The
external units are pricier but are easier to install. Your burner will
include the software you need to make DVDs and CDs.

If you get an external unit, its connection to the computer will be
critical. You'll want to hook it up with Firewire or USB 2.0. Both
move a massive amount of data quickly. That's important, because video
files especially can be huge. If your computer doesn't have Firewire
or USB 2.0 ports, you can install them with an add-in card. A card
with either type of port should cost less than $50. There are also
combination cards available.

When shopping, you'll see numbers like 2.4x/2.4x/8x. Those are the
numbers for one-time recordable (-R or +R), re-writable (-RW or +RW)
and read (ROM). You'll see the same arrangement on CD burners, but the
numbers are not comparable. DVD-R runs from 1x (about 1.3 megabytes
per second) to 4x. DVD+R runs up to 2.4MBps. In CD-ville, 1x is 150
kilobytes per second. So the DVD rate is approximately nine times that
of a CD. Talk about fast!

The DVD muddle is about to get worse. Today's ruby laser will be
supplanted by a blue laser, probably beginning next year. The blue
laser will read two-sided disks with 40 to 50 GB of data. But there
are two standards, and no agreement is in sight. 
=== Cut ===


 JG>
 JP>> One item of note. CD though, yesterday, I used the CDRW-DVD in
 JP>> my G-41 Thinkpad and being the lone device, it has to buffer the
 JP>> whole CD and then burn it. It was quite quick. New device ? Fast
 JP>> CPU? 6 minutes to buffer and <5 to burn.
 JG>
 JG> Generally, it's the speed of the drive.  The CPU would hopefully be
 JG> out of the equation these days with the use of DMA techniques to
 JG> transfer data.
 JG>
 JG>
 JG>
 JG> -+-
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Regards,
George Vandervort
InterNet EMail: georgev@austin.rr.com
Tech Support: http://home.austin.rr.com/llr/tech.html

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