Re: Recommendations for external DVD-ROM drive?

"Fred Maxwell [email protected] [EAC]" <[email protected]> Thu, 8 Oct 2020 20:30:13 -0400
Newsgroups gmane.comp.audio.eac.user
Message-ID <[email protected]>
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Even the Blu-ray Disc Association refers to the UV-curable resin Hard-coat =
technology as providing "moderate scratch-resistance.=E2=80=9D  They say th=
at "you will be able to obtain a secure feeling comparable to that of DVDs =
by the conventional Hard-coat, from a viewpoint of scratch-resistance.=E2=
=80=9D  (source:  White Paper Blu-ray Disc Format, 5th edition, January 201=
8).

The fact that you can=E2=80=99t see microscopic scratches with your naked e=
ye doesn=E2=80=99t mean they aren=E2=80=99t there.  Fortunately, the format=
 includes pretty robust ED&C to deal with such scratches as well as fingerp=
rints and other surface contaminants.

> On Oct 8, 2020, at 7:22 PM, Jerry Baker jbaker6953-/[email protected] [EAC] <EAC@y=
ahoogroups.com> wrote:
>=20
> That's why they're coated. If they weren't they would be impossibly=20
> unreliable. If you have a coaster laying around, try to scratch it. A=20
> CD/DVD can be scratched just by rubbing it with a napkin. Not so with=20
> BD-R. I did try setting it on the concrete, standing on it, and=20
> twisting. That did scratch it.
>=20
> On 10/8/2020 3:46 PM, Fred Maxwell [email protected] <mailto:_ea=
[email protected]> [EAC] wrote:
> > Pits on Blu-ray are 130 nanometers wide (0.000001 mm).  My eyes just=20
> > don=E2=80=99t resolve that well, even with reading glasses, so I wouldn=
=E2=80=99t be=20
> > able to see a scratch that small.
>=20
>=20


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      <p><div class>Even the Blu-ray Disc Association refers to the UV-cura=
ble resin Hard-coat technology as providing "moderate scratch-resistance.=
=E2=80=9D &nbsp;They say that "you will be able to obtain a secure
feeling comparable to that of DVDs by the conventional Hard-coat, from a vi=
ewpoint of scratch-resistance.=E2=80=9D &nbsp;(source: &nbsp;<i class>White=
 Paper Blu-ray Disc Format</i>, 5th edition, January 2018).</div><div class=
><div><br class></div><div><div class>The fact that you can=E2=80=99t see m=
icroscopic scratches with your naked eye doesn=E2=80=99t mean they aren=E2=
=80=99t there. &nbsp;Fortunately, the format includes pretty robust ED&amp;=
C to deal with such scratches as well as fingerprints and other surface con=
taminants.</div><div class><br class></div></div><div><blockquote type=3D"c=
ite" class><div class>On Oct 8, 2020, at 7:22 PM, Jerry Baker <a href=3D"ma=
ilto:jbaker6953-/[email protected]" class>jbaker6953-/[email protected]</a> [EAC] &lt;<a href=
=3D"mailto:[email protected]" class>[email protected]</a>&gt; wrote:</d=
iv><br class=3D"Apple-interchange-newline"><div class><div id=3D"ygrp-mlmsg=
" style=3D"font-size: 13px;font-family: Arial, helvetica, clean, sans-serif=
;font-style: normal;font-weight: normal;letter-spacing: normal;text-align: =
start;text-indent: 0px;text-transform: none;white-space: normal;word-spacin=
g: 0px;" class><div id=3D"ygrp-msg" class><div id=3D"ygrp-text" style=3D"fo=
nt-family: Georgia;" class><p style=3D"margin: 0px 0px 1em;" class>That's w=
hy they're coated. If they weren't they would be impossibly<span class=3D"A=
pple-converted-space">&nbsp;</span><br class>unreliable. If you have a coas=
ter laying around, try to scratch it. A<span class=3D"Apple-converted-space=
">&nbsp;</span><br class>CD/DVD can be scratched just by rubbing it with a =
napkin. Not so with<span class=3D"Apple-converted-space">&nbsp;</span><br c=
lass>BD-R. I did try setting it on the concrete, standing on it, and<span c=
lass=3D"Apple-converted-space">&nbsp;</span><br class>twisting. That did sc=
ratch it.<br class><br class>On 10/8/2020 3:46 PM, Fred Maxwell<span class=
=3D"Apple-converted-space">&nbsp;</span><a href=3D"mailto:_eac_moderator@ma=
il2fm.com" style=3D"font-family: Verdana;" class>[email protected]=
</a><span class=3D"Apple-converted-space">&nbsp;</span>[EAC] wrote:<br clas=
s>&gt; Pits on Blu-ray are 130 nanometers wide (0.000001 mm). &nbsp;My eyes=
 just<span class=3D"Apple-converted-space">&nbsp;</span><br class>&gt; don=
=E2=80=99t resolve that well, even with reading glasses, so I wouldn=E2=80=
=99t be<span class=3D"Apple-converted-space">&nbsp;</span><br class>&gt; ab=
le to see a scratch that small.<br class></p></div><div style=3D"color: rgb=
(255, 255, 255);height: 0px;" class></div></div></div></div></blockquote></=
div><br class></div></p>

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        Posted by: Fred Maxwell &lt;[email protected]&gt;        <=
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