how to test for scratches on blank disc? - Club CDFreaks

MrMaki · 06-07-2003

is there a way to test a blank used CD for scratches or bad sectors? or this can be done only after burns ?

*rdgrimes* · 06-07-2003

You can look at it for scratches, usualll the top and bottom discs on a spindle are the ones to watch.
There's really no such thing as "bad sectors" on a blank CDR. A defective disc may have an area that is "bad", but there's no way to test for it, again other than looking.

*BoSkin* · 07-07-2003

Quote:

Originally posted by rdgrimes

but there's no way to test for it, again other than looking.

Well, unless you buy yourself a special equipment that will allow you to "measure a CD-R that contains no data".
Then your test result might look like this :

MrMaki · 07-07-2003

Oh.. That's looks cool !

thanks for the help

*BoSkin* · 07-07-2003

Quote:

Originally posted by MrMaki

Oh.. That's looks cool !

I'd rather say it's HOT

MrMaki · 07-07-2003

he he

**spath** · 07-07-2003

> Then your test result might look like this :

Except BLER cannot be measured on a blank disc.

MrMaki · 08-07-2003

So there is no other way. I have to burn data on it to see if it's usable.

*BoSkin* · 08-07-2003

Quote:

Originally posted by spath

Except BLER cannot be measured on a blank disc.

Yes, BLER is being measured on written data.

*Airhead* · 08-07-2003

A CATS-machine is a little on the expensive side for home users I'd say

*BoSkin* · 08-07-2003

Quote:

Originally posted by Airhead
A CATS-machine is a little on the expensive side for home users I'd say

Right but it's a one-time and worthy investment .

**spath** · 08-07-2003

> Yes, BLER is being measured on written data.

Then replace the picture instead of tampering
with it.

As for cheap testing of blank media, one could
try ATER measurements.

*BoSkin* · 09-07-2003

@spath,

Gotcha !

I too like your more and more fashionable way of talking to people.
But you must replace it and this is my kind advice to you.

**spath** · 09-07-2003

Just to make things clear for everybody : the original question was
about testing defects on blank discs and you decided to mention special
test equipment in your first reply. Unfortunately you chose to add
a picture of a bler plot, which precisely cannot be obtained with
a blank disc.

When I pointed out that this plot was not matching the question, you
edited your copy of the picture and removed the "BLER" word from it.
For reference, the original picture is at
http://www.audiodev.com/default.asp?...12182253314071

What exactly is the point of this modification ? Just removing the
legend doesn't make your post correct and can only confuse people
reading this thread. If I now tell you that I can still recognize
a CATS BLER plot from the scale on the right, will you further
edit the picture ?

*rdgrimes* · 09-07-2003

Quote:

Just to make things clear for everybody :

The question was: can one test a blank disc for quality.
The answer is: for all intents and purposes, the casual user cannot do this.
I think this thread has out-lived it's usefullness.
Perhaps a new thread should be started to discuss the other issues.

06-07-2003	#1 (permalink)
MrMaki New on Forum Join Date: Feb 2002 Posts: 14	how to test for scratches on blank disc? <a href='http://adstats.cdfreaks.com/www/delivery/ck.php?n=a13febf7&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='http://adstats.cdfreaks.com/www/delivery/avw.php?zoneid=30&cb=INSERT_RANDOM_NUMBER_HERE&n=a13febf7' border='0' alt='' /></a> is there a way to test a blank used CD for scratches or bad sectors? or this can be done only after burns ?

08-07-2003	#10 (permalink)
Airhead Letiled Modelatol Join Date: Feb 2002 Location: La Suède Posts: 6,937	A CATS-machine is a little on the expensive side for home users I'd say __________________ This line is currently vacant. Or Is It??? You want fast answers? Use our search. <-- Or else! If you have not already, read our rules! <-- Or else again! bcn_246: "Wales are shitty animals to, all they do is swim around and make funny noises that people cant hear." You really should join us on IRC! IrcNet, #cdfreaks-int \| Or go here Fear my massive avatar history log! Not updated! "But do they keep increasing in size like mine?" - kwkard

09-07-2003	#13 (permalink)
BoSkin CDFreaks Resident Join Date: May 2002 Location: Sthlm Posts: 5,497	@spath, Gotcha ! I too like your more and more fashionable way of talking to people. But you must replace it and this is my kind advice to you. __________________ CloneCD - Down & Dirty... Disc Identification Code Disc Grading System OPC & Beta + & - Defeating Cactus w Feurio!® CDR components & Dye characteristics List of CD/DVD media sites in N. America & U.K.

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06-07-2003	#2 (permalink)
rdgrimes Retired Moderator Join Date: Jun 2002 Location: Deadwood Posts: 11,449	You can look at it for scratches, usualll the top and bottom discs on a spindle are the ones to watch. There's really no such thing as "bad sectors" on a blank CDR. A defective disc may have an area that is "bad", but there's no way to test for it, again other than looking.

07-07-2003	#4 (permalink)
MrMaki New on Forum Join Date: Feb 2002 Posts: 14	Oh.. That's looks cool ! thanks for the help

07-07-2003	#6 (permalink)
MrMaki New on Forum Join Date: Feb 2002 Posts: 14	he he

07-07-2003	#7 (permalink)
spath Moderator Join Date: Jan 2002 Posts: 967	> Then your test result might look like this : Except BLER cannot be measured on a blank disc.

08-07-2003	#8 (permalink)
MrMaki New on Forum Join Date: Feb 2002 Posts: 14	So there is no other way. I have to burn data on it to see if it's usable.

08-07-2003	#12 (permalink)
spath Moderator Join Date: Jan 2002 Posts: 967	> Yes, BLER is being measured on written data. Then replace the picture instead of tampering with it. As for cheap testing of blank media, one could try ATER measurements.

09-07-2003	#14 (permalink)
spath Moderator Join Date: Jan 2002 Posts: 967	Just to make things clear for everybody : the original question was about testing defects on blank discs and you decided to mention special test equipment in your first reply. Unfortunately you chose to add a picture of a bler plot, which precisely cannot be obtained with a blank disc. When I pointed out that this plot was not matching the question, you edited your copy of the picture and removed the "BLER" word from it. For reference, the original picture is at http://www.audiodev.com/default.asp?...12182253314071 What exactly is the point of this modification ? Just removing the legend doesn't make your post correct and can only confuse people reading this thread. If I now tell you that I can still recognize a CATS BLER plot from the scale on the right, will you further edit the picture ?