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Gear / Technical Help => TS Knowledge Base / Archive => Computer Recording => Topic started by: morst on February 08, 2023, 07:14:20 PM
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I was searching for definitive information regarding the difference between the two formats of writable BluRay media, and found a bulletin from Verbatim which explains a lot.
It's on the web as a PDF, so I thought I'd share it here in case they ever remove it because it's a nice clear explanation.
I had to break it in pieces to keep the file sizes in range for this site.
original link: BD-R LTH type Product introduction
https://www.verbatim-europe.co.uk/includes/binary_details.php3?id=7040
The wording of the first page past the title page is as follows:
What is BD-R LTH type?
• It is just another type of BD-R, specified in Spring 2008 by Blu-ray Disc Alliance
• Recording layer is different:
• First type of BD-R is made of inorganic material
• Signal changes polarity from High-to-Low (HTL)
• AZO BD-R is made of organic material
• Signal changes polarity from Low-to-High (LTH)
• BDA states mandatory use of wording „BD-R LTH type“on packaging and disc label
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If you are buying BD-R media, you should only use HTL discs which have great long-term stability.
LTH discs should be avoided because the organic dyes degrade which causes data corruption.
https://digistor.com/not-all-blu-ray-discs-are-created-equal-but-does-bd-r-quality-matter/ (https://digistor.com/not-all-blu-ray-discs-are-created-equal-but-does-bd-r-quality-matter/)
Here is a list of disc manufacturers with manufacturing processes. Note that the same manufacturers often produce both HTL and LTH discs - you need to make sure you are buying the specific Media Type ID listed.
https://blu-raydisc.info/licensee-list/discmanuid-licenseelist.php (https://blu-raydisc.info/licensee-list/discmanuid-licenseelist.php)
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Here is a list of disc manufacturers with manufacturing processes. Note that the same manufacturers often produce both HTL and LTH discs - you need to make sure you are buying the specific Media Type ID listed.
https://blu-raydisc.info/licensee-list/discmanuid-licenseelist.php (https://blu-raydisc.info/licensee-list/discmanuid-licenseelist.php)
Thanks for the additional info.
I used to read DVD-R codes with a bit of Mac software called DVD Media Inspector. It still works for DVD-R, and is still available online, here (https://raktajino-sakura-ne-jp.translate.goog/dvdmediainspector/dvdmediainspector.html?_x_tr_sch=http&_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en-US), but has not been updated in a long time, from version 1.2.0 of 2013.
Today I found how to read BD-R or DVD codes here:
https://en.wikipedia.org/wiki/Media_Identification_Code (https://en.wikipedia.org/wiki/Media_Identification_Code)
in Mac OS, go to the Terminal app (command line shell) and simply type the following with a disc in the reader:
drutil status
the Media ID field will list your brand and code!
I've got a few remaining RITEK BD2 discs which are HTL. w00t! But confirmed, these JVC-AM S6L are the LTH discs. :-(
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I have used over 200 of these. My go to BD-R for both reliability and price.
Picasso Branded
AVIC UMEDISC (HK) LIMITED
UMEBDR
016
6x
HTL
25GB (12cm).
For those unfamiliar with PICASSO, these are made in the same plant as the highly rated Kodak Brand.