Re: question about burning and then reading (dd) to confirm sha256sum

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On Fri, 2015-04-03 at 18:20 +1030, Tim wrote:
> On Thu, 2015-04-02 at 11:11 -0600, jd1008 wrote:
> > made by Sony, which I thought paid better attention to the quality of
> > production
> 
> I seem to recall that Sony doesn't actually make their own.  But
> regardless of how well media may be regarded, you often need to make
> compatibility tests with your own equipment.
> 
> Many years ago, I tried out various different brands, on purpose.  Some
> were just awful (a friend used to buy the cheapest, with nearly a 30%
> failure rate - around 1 in 3 discs needed to be thrown away).  I found
> Verbatim to be the best with my equipment, and it was a significantly
> noticeable difference.  
> 
> Compared to others, a freshly inserted disc was recognised the fastest
> (so it was easier to focus on and read the codes), some will sit there
> going whiz-whur, whiz-whur in the drive, for prolonged periods, while it
> attempts to figure out what's being inserted.  I can only remember
> having about three discs fail during burn in the last several years
> (which is a hell of lot better than brands my friend has used).  The
> discs have remained easily readable many years later (and that is a
> fault that a lot of people don't even think about).  While some people
> may only require a backup to last a few weeks before it becomes too
> out-of-date to be useful, other people need long-term archival storage.
> 
> It's getting harder to go out and buy discs, retail, here.  I suspect
> because the movie piracy black market has changed to watching them as
> files on a computer, rather than inserting a disc into a player plugged
> into a television set.  There are only a few disc varieties available,
> mostly terribly cheapies.  It's also harder to buy boxes or sleeves,
> than it used to be.  It's more than a bit annoying to not have something
> to put your discs in.
> 
> -- 
> tim@localhost ~]$ uname -rsvp
> 
> Linux 3.18.9-100.fc20.i686 #1 SMP Mon Mar 9 17:04:05 UTC 2015 i686
> 
> All mail to my mailbox is automatically deleted, there is no point trying
> to privately email me, I will only read messages posted to the public lists.
> 
> George Orwell's '1984' was supposed to be a warning against tyranny, not
> a set of instructions for supposedly democratic governments.
> 

I used to work for an advertising/PR firm that used optical media for
client pitches and attitude modification presentations. We'd go through
a couple of hundred blanks a quarter. 

>From that experience I've deduced that the best predictor of success
with optical media is country of manufacture.  My preference, in order
is:

Japan
Taiwan

everything else goes straight to recycle.

Taio Yuden (Japan, Taiwan) are the most reliable in my experience.
Depending upon where you are they may be branded JVC. Note that JVC
sources from many places so check the country of manufacture. Japanese
produced media is not usually available in stores in the US, but you can
find them easily on the Internet. 

Verbatim (Taiwan) generally pretty good. I can't say the same for
Verbatim (India). 

For some mysterious reason, TY and Verbatim (Taiwan) sell for a premium
over other media. I wonder if there is a correlation?

RBM

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