On Fri, 23 Dec 2011 21:05:33 +0000, Andy Champ
wrote:

On 23/12/2011 17:40, J G Miller wrote:
Since a Blu-Ray (tm) disc (phew spelt it correctly this time) "contains"
considerably more data than a CD or DVD, does it takes a significantly
longer time to press.

No. It may take longer to write the master, but the per-disc stamping
is just that - stamp.

Layers cost time.

There's an article here which may need to be taken cautiously. It may
not be badly wrong, but I'm not sure that it is worded exactly
correctly. For what it's worth here are two sentences extracted from a
description of the structure of a Blu-Ray disc versus a DVD:
http://electronics.howstuffworks.com/blu-ray2.htm

Blu-ray discs only do the injection-molding process on a single
1.1-mm disc, which reduces cost. That savings balances out the cost
of adding the protective layer, so the end price is no more than the
price of a regular DVD.



Since time is money on a production line, the cost of pressing a
Blu-Ray is therefore more than that of a CD or DVD.

But not of the order of magnitude in price difference in the stores.

Remember when DVDs were of the order of GBP 30, and now you can get
DVDs for under GBP 5 in the supermarket?

Given time, the cost of Blu-Ray disc releases will eventually come
down to a more reasonable level.

Andy

--
Peter Duncanson
(in uk.tech.digital-tv)

"Peter Duncanson" wrote in message
...



Since time is money on a production line, the cost of pressing a
Blu-Ray is therefore more than that of a CD or DVD.

But not of the order of magnitude in price difference in the stores.

Remember when DVDs were of the order of GBP 30, and now you can get
DVDs for under GBP 5 in the supermarket?

Given time, the cost of Blu-Ray disc releases will eventually come
down to a more reasonable level.


Who makes the DVD and BluRay pressings?
Is it maybe for DVD movies that several firms can but in the case of BluRay
movies Sony involved in all.
Regards
David

On 24/12/2011 10:52, David wrote:


"Peter Duncanson" wrote in message
...



Since time is money on a production line, the cost of pressing a
Blu-Ray is therefore more than that of a CD or DVD.

But not of the order of magnitude in price difference in the stores.

Remember when DVDs were of the order of GBP 30, and now you can get
DVDs for under GBP 5 in the supermarket?

Given time, the cost of Blu-Ray disc releases will eventually come
down to a more reasonable level.


Who makes the DVD and BluRay pressings?
Is it maybe for DVD movies that several firms can but in the case of
BluRay movies Sony involved in all.
Regards
David

A word of caution: I'm far more up on DVDs than BD. Which is why I had
to rummage in Wikipedia to be sure

"Blu-ray Disc (official abbreviation BD) is an optical disc storage
medium designed to supersede the DVD format. The plastic disc is 120 mm
in diameter and 1.2 mm thick, the same size as DVDs and CDs. Blu-ray
Discs contain 25 GB (23.31 GiB) per layer, with dual layer discs (50 GB)
being the norm for feature-length video discs. Triple layer discs (100
GB) and quadruple layers (128 GB) are available for BD-XL Blu-ray
re-writer drives.[2]"

And as I can't find a reference only say that I'm pretty sure there are
other plants than Sony that produce BD discs.

Andy

In message , Andy Champ
writes
And as I can't find a reference only say that I'm pretty sure there are
other plants than Sony that produce BD discs.
Mine, both write once and re-write are Panasonic.
--
Clive