Do DVD-R and/or DVD/RW disks new out of the box have any pre-recorded
stuff on them? If so, does anyone know what that is? Maybe RW disks
do, in order to render them re-writable, but maybe R disks do not
since they are single-use?
On Sat, 29 Dec 2007 12:04:58 GMT, gecko <alpha@olympus.net> wrote:
>I'm curious.
>
>Do DVD-R and/or DVD/RW disks new out of the box have any pre-recorded
>stuff on them? If so, does anyone know what that is? Maybe RW disks
>do, in order to render them re-writable, but maybe R disks do not
>since they are single-use?
The information about manufacturer etc is probably "pressed" into the
disc.
I draw this conlcusion after having successfully erased DVD+RW discs
in the oven.
This made the discs behave as new, and the manufacturer info is still
there.
As a sidenote: I did it because erasing in either computer or
DVD-Recorder does not erase all the info on the disc, so I could not
reuse discs in certain recorders after writing them in the PC-burner.
I could also recover some of the discs that stopped working (refused
to erase).
The treatment was 100deg celcius for 15 minutes. It works with my 4x
DVD+RW discs (but not the 2x DVD-RW and not 8x DVD+RW that I tested.)
/Jan
On Sat, 29 Dec 2007 14:14:36 +0100, Jan B <nospam@nospam.se> wrote:
>The information about manufacturer etc is probably "pressed" into the
>disc.
>I draw this conlcusion after having successfully erased DVD+RW discs
>in the oven.
>This made the discs behave as new, and the manufacturer info is still
>there.
>
>As a sidenote: I did it because erasing in either computer or
>DVD-Recorder does not erase all the info on the disc, so I could not
>reuse discs in certain recorders after writing them in the PC-burner.
>I could also recover some of the discs that stopped working (refused
>to erase).
>
>The treatment was 100deg celcius for 15 minutes. It works with my 4x
>DVD+RW discs (but not the 2x DVD-RW and not 8x DVD+RW that I tested.)
>/Jan
Thanks Jan.
It was against my basic instincts to put disks in the oven, but being
brave, I tried two DVD-RW disks that I have which are now unusable.
They still do not work. Behave basically the same - both of my
machines still do not even recognize the presence of the disks in
drive.
gecko wrote:
> On Sat, 29 Dec 2007 14:14:36 +0100, Jan B <nospam@nospam.se> wrote:
>
>> The information about manufacturer etc is probably "pressed" into the
>> disc.
>> I draw this conlcusion after having successfully erased DVD+RW discs
>> in the oven.
>> This made the discs behave as new, and the manufacturer info is still
>> there.
>>
>> As a sidenote: I did it because erasing in either computer or
>> DVD-Recorder does not erase all the info on the disc, so I could not
>> reuse discs in certain recorders after writing them in the PC-burner.
>> I could also recover some of the discs that stopped working (refused
>> to erase).
>>
>> The treatment was 100deg celcius for 15 minutes. It works with my 4x
>> DVD+RW discs (but not the 2x DVD-RW and not 8x DVD+RW that I tested.)
>> /Jan
>
>
> Thanks Jan.
>
> It was against my basic instincts to put disks in the oven, but being
> brave, I tried two DVD-RW disks that I have which are now unusable.
> They still do not work. Behave basically the same - both of my
> machines still do not even recognize the presence of the disks in
> drive.
>
> Thanks anyway
>
> Gecko
DVD-RW dye has a melting point of about 200degrees C. but only for
a fraction of a second - the laser does this as you write over.
In article <iqdcn3tfg6sf6vnmfotp04g4tht4aooktv@4ax.com>, alpha@olympus.net says...
> I'm curious.
>
> Do DVD-R and/or DVD/RW disks new out of the box have any pre-recorded
> stuff on them? If so, does anyone know what that is? Maybe RW disks
> do, in order to render them re-writable, but maybe R disks do not
> since they are single-use?
>
> Thanks
>
> Gecko
>
Analog records, audio tape, and other media have always arrived as a
blank for the user. If anything needs to be written on them then it's
the final user's equipment that will pre-condition the media, such as
the application of a bias current to audio tape.
I once did buy a Memorex video cassette that had a pattern recorded on
it. What its purpose was, I don't know. I assume it was part of a Q.C.
lot test.
Chet at his house wrote:
> In article <iqdcn3tfg6sf6vnmfotp04g4tht4aooktv@4ax.com>,
> alpha@olympus.net says...
>> I'm curious.
>>
>> Do DVD-R and/or DVD/RW disks new out of the box have any pre-recorded
>> stuff on them? If so, does anyone know what that is? Maybe RW disks
>> do, in order to render them re-writable, but maybe R disks do not
>> since they are single-use?
>>
>> Thanks
>>
>> Gecko
>>
>
> Analog records, audio tape, and other media have always arrived as a
> blank for the user. If anything needs to be written on them then it's
> the final user's equipment that will pre-condition the media, such as
> the application of a bias current to audio tape.
>
> I once did buy a Memorex video cassette that had a pattern recorded on
> it. What its purpose was, I don't know. I assume it was part of a Q.C.
> lot test.
>
> CB
AFIK every DVD has codes that identify the manufacturer! If I put a
blank/erased DVD that is Not a Sony in a Sony Camcorder it plaintively
says it 'prefers a Sony DVD'!-)
> >
> > Analog records, audio tape, and other media have always arrived as a
> > blank for the user. If anything needs to be written on them then it's
> > the final user's equipment that will pre-condition the media, such as
> > the application of a bias current to audio tape.
> >
> > I once did buy a Memorex video cassette that had a pattern recorded on
> > it. What its purpose was, I don't know. I assume it was part of a Q.C.
> > lot test.
> >
> > CB
>
> AFIK every DVD has codes that identify the manufacturer! If I put a
> blank/erased DVD that is Not a Sony in a Sony Camcorder it plaintively
> says it 'prefers a Sony DVD'!-)
>
This is true but it's like the old shellac discs used in home recorders,
it has a label but the recording surface is blank.
In article <MPG.21e06e3ba85975ea989693@news.giganews.com>,
Chet at his house <chet@giganews.com> wrote:
>In article <iqdcn3tfg6sf6vnmfotp04g4tht4aooktv@4ax.com>,
>alpha@olympus.net says...
>> I'm curious.
>>
>> Do DVD-R and/or DVD/RW disks new out of the box have any pre-recorded
>> stuff on them? If so, does anyone know what that is? Maybe RW disks
>> do, in order to render them re-writable, but maybe R disks do not
>> since they are single-use?
>>
>> Thanks
>>
>> Gecko
>>
>Analog records, audio tape, and other media have always arrived as a
^^^^^^^^^^^^^^^ - Surely you must be kidding about that!!! :-)
>blank for the user. If anything needs to be written on them then it's
>the final user's equipment that will pre-condition the media, such as
>the application of a bias current to audio tape.
In article <MPG.21e30fec81e4986f989694@news.giganews.com>,
Chet at his house <chet@giganews.com> wrote:
>In article <EoSdnfvKTsSPW-vanZ2dnUVZ_sDinZ2d@comcast.com>,
>rick0.merrill@NOSPAM.gmail.com says...
>
>> >
>> > Analog records, audio tape, and other media have always arrived as a
>> > blank for the user. If anything needs to be written on them then it's
>> > the final user's equipment that will pre-condition the media, such as
>> > the application of a bias current to audio tape.
>> >
>> > I once did buy a Memorex video cassette that had a pattern recorded on
>> > it. What its purpose was, I don't know. I assume it was part of a Q.C.
>> > lot test.
>> >
>> > CB
>>
>> AFIK every DVD has codes that identify the manufacturer! If I put a
>> blank/erased DVD that is Not a Sony in a Sony Camcorder it plaintively
>> says it 'prefers a Sony DVD'!-)
>>
>
>This is true but it's like the old shellac discs used in home recorders,
>it has a label but the recording surface is blank.
You didn't record on shellac disks. And most of the shellac disks
went away during WWII to be replaced by other compounds.
However the disk recorders used surfaces coated with cellulose
nitrate [the commercial disks] or cellulose acetate.
The former threads from the cutter head were extremly flammable -
and were typically sucked into a water containing bottle during the
cutting process to preclude fire.
Chet at his house wrote:
> In article <EoSdnfvKTsSPW-vanZ2dnUVZ_sDinZ2d@comcast.com>,
> rick0.merrill@NOSPAM.gmail.com says...
>
>>> Analog records, audio tape, and other media have always arrived as a
>>> blank for the user. If anything needs to be written on them then it's
>>> the final user's equipment that will pre-condition the media, such as
>>> the application of a bias current to audio tape.
>>>
>>> I once did buy a Memorex video cassette that had a pattern recorded on
>>> it. What its purpose was, I don't know. I assume it was part of a Q.C.
>>> lot test.
>>>
>>> CB
>> AFIK every DVD has codes that identify the manufacturer! If I put a
>> blank/erased DVD that is Not a Sony in a Sony Camcorder it plaintively
>> says it 'prefers a Sony DVD'!-)
>>
>
> This is true but it's like the old shellac discs used in home recorders,
> it has a label but the recording surface is blank.
I think there is a track of data that identifies the disk, r/w, mfg, and
who knows what?
Question about DVD-R and DVD-RW 
Linear Mode
