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Fair use image needed

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This article is in need of a fair use image of a BD-R. If someone can upload one that would be greatly appreciated. --Jack Zhang 04:49, 28 October 2006 (UTC)[reply]

Currency type needed

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This article mentions several prices, in dollars, but does not state which nation's dollars are meant. —The preceding unsigned comment was added by 203.97.251.203 (talk) 06:00, 19 January 2007 (UTC).[reply]

Isn't the standard is you don't specify what country Dollars you are talking about the assumtion is it's USD? Arwen4014 (talk) 12:39, 10 July 2008 (UTC)[reply]

Well if you can covert £ (Pounds) in Great Britain into dollars (USA) or whatever country you need a conversion in, a Blu-Ray Disc ReWriteable with a 25GB compacity (BR-RE) costs £(GB) 24.94, this is for a single disc, that has enouth for 240 minutes of recording time. J2F Duck (talk) 07:02, 20 February 2008 (UTC)[reply]

While on this subject I see there are estimated costs of the Recorders and DIscs on the page. I'm going to update them because the prices are falling. But what about just removing that information all together. Arwen4014 (talk) 12:41, 10 July 2008 (UTC)[reply]

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The CD link on the page links to Compant Disc instead of Compact Disc.

Semi-protection

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{{editprotected}} There doesn't seem to be any valid reason for this to remain semi-protected all this time. Could someone unprotect it please? —Locke Cole • t • c 19:06, 23 September 2007 (UTC)[reply]

Done. Cheers. --MZMcBride 19:19, 23 September 2007 (UTC)[reply]

Theoretical Maximum of reading

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the page states that the theoretical maximum of reading would be around 12x because any faster the disc would wobble too much to be read properly. I think that's a practical and not a theoretical limit. —Preceding unsigned comment added by 88.0.142.204 (talk) 22:20, 13 January 2008 (UTC)[reply]

It's a theoretical limit because no one has actually made a 12x drive Nil Einne (talk) 09:07, 17 February 2008 (UTC)[reply]
People out there try to guess when BD-RE 4x will get out. Why isn't it there? Is there a theoretical limit as well? Is it - as the missing 4x variant shows - lower than for BD-R? —Preceding unsigned comment added by 212.149.48.43 (talk) 17:43, 17 July 2009 (UTC)[reply]

There should be footnotes made for each drive speed to make note of when a commercial drive has been made available and an asterisk next to each speed that has yet to be made viable at the consumer level.

Laser frequency.

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Does anyone here know the frequency that the Blu-ray-recordable laser operates at? I know the reader works with a 405nm laser - is the writer operating somewhere in the ultra-violet? —Preceding unsigned comment added by SteveBaker (talk • contribs) 12:43, 3 March 2008 (UTC)[reply]

Read and write - same wavetength. 109.153.242.10 (talk) 16:38, 21 December 2011 (UTC)[reply]

Redirect Needed

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I need in-site reference of BD-R LTH redirect to here. How can I done that? —Preceding unsigned comment added by 75.5.123.153 (talk) 20:46, 26 March 2008 (UTC)[reply]

Done. Cheers. --Toobulkeh (talk) 21:57, 8 September 2009 (UTC)[reply]

BD-R LTH info may be outdated

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The discussion of BD-R LTH discusses dates in early 2008 as future events. I cannot find concrete data, have the planned changes been done, if so should the article be updated? 24.130.57.12 (talk) 16:00, 30 September 2009 (UTC)[reply]


Max file size?

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Where do I find out the max file size that can be burned? I'm sick of rarring huge files into chunks to burn on DVD-R -- with the max 2G filesize. Not having to do that would be a big reason for me to switch despite the triple-per-byte blank media cost... ClintJCL (talk) 02:28, 11 December 2009 (UTC)[reply]

I've just been trying to figure this out. I can't find information on the web. Writing a single file the size of the free space reported by Windows (47332mb exactly) doesn't work; when you come to burn, Windows says the burn requires 48.9 GB. That's not useful, since it's rounded off. Toby Douglass (talk) 21:28, 17 May 2010 (UTC)[reply]
The max file size is calculated no differently than for a CD or DVD - it is a function of the file system used when authoring and capacity of the media. Using the UDF 2.50 format when writing backup files to BD media yields a max single file size of 16EB; well beyond the capacity of any media you will be using. I don't think this information would be particularly valuable in this article as it has nothing to do with the media itself - rather the manner in which information is recorded to the media. Goyuix (talk) 04:06, 2 December 2013 (UTC)[reply]
Where did you get the "2G" (I assume you mean 2 GiB, not GB) figure from? The file size limit of ISO9660 is 4 GiB minus one byte, like that of FAT32. I am guessing you got it from the genisoimage manual. This is an error. (I know I am late to the "party", but just commented here for the sake of completeness. Remember, there are no deadlines.) CDVDBD 💿 📀 13:28, 16 November 2024 (UTC)[reply]

New Egg Spam

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Is it fair to add such commercial site's reference. Does the pricing matters here ? —Preceding unsigned comment added by Almast (talk • contribs) 01:46, 6 January 2010 (UTC)[reply]

I don't believe pricing is relevant here - choosing one vendor isn't indicative of all market, and price changes frequently. —Preceding unsigned comment added by 12.6.90.3 (talk) 20:54, 9 December 2010 (UTC)[reply]

Correction of the mebibyte values

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36 Mbit = 36 x 10 6 bit = 4500000 bytes = 4.5 MB

1 MiB = 2 20 = 1024 kibibyte = 1048576 bytes

Therfore:
4500000 bytes / 1048576 bytes = 4.29 MiB

The same value is reached if you use the Ration SI/Binary of 0.9537 for megabyte to mebibyte for example in the article on Mebibyte:

4.5 MB x 0.9537 = 4.29165 MiB

9 MB x 0.9537 = 8.5833 MiB

18 MB x 0.9537 = 17.1666 MiB

27 MB x 0.9537 = 25.7499 MiB

36 MB x 0.9537 = 34.3332 MiB

45 MB x 0.9537 = 42.9165 MiB

54 MB x 0.9537 = 51.4998 MiB

(Sababu (talk) 11:50, 18 September 2010 (UTC)).[reply]

For the GB to GiB conversion factor 0.9313 would have to be used (Gibibyte):
25 GB x 0.9313 = 23.2825 GiB
50 GB x 0.9313 = 46.565 GiB
(Sababu (talk) 12:02, 18 September 2010 (UTC))[reply]

wrong speed info for 1x, 2x, etc.

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see [1]

the speeds given on the page are based on the speed of the hard drive reading the data, not the blu-ray media actual speed. the actual 1x speed is 36MB/s. you can multiply for 2x to get 72MB/S etc. Blu-ray specification organization probably erroneously uses SI units instead of IEC units in their specification. and I suspect that since the disc industry uses GiB for disc data sizes, you should probably also use (?) MiB for the speed, since Microsoft typically also uses MiB and labels it as MB, etc., a lot of the industry does this (like with RAM, SSD's etc)... so

  • 1x=36MiB/s×1=36MiB/s
  • 2x=36MiB/s×2=72MiB/s
  • 3x=36MiB/s×3=108MiB/s
  • 4x=36MiB/s×4=144MiB/s
  • 6x=36MiB/s×6=216MiB/s
  • 8x=36MiB/s×8=288MiB/s
  • 10x=36MiB/s×10=360MiB/s
  • 12x=36MiB/s×12=432MiB/s
  • 14x=36MiB/s×14=504MiB/s
  • 16x=36MiB/s×16=576MiB/s
  • 18x=36MiB/s×18=648MiB/s
  • 20x=36MiB/s×20=720MiB/s

and so on. also, for those who don't know the difference between IEC (computer units) and SI units, I wrote a web page which shows the differences. [2] see also the web page on IEC unit specification [3] .


  1. ^ blu-ray no-fee specification 2012
  2. ^ SI and IEC Units compared side-by-side
  3. ^ IEC unit definitions: The binary prefixes

Jmichae3 (talk) 06:20, 11 January 2013 (UTC)[reply]

You apparently confused MB/s or MiB/s with Mbit/s. "Mbit" means "megabit", which is just an eighth of a megabyte. Eight bits are one byte.
If 1× were 36 MB or MiB per second, this would mean a drive with a reading speed of 12×, commonly the highest reading speed on desktop drives, would exceed 400 MB/s or MiB/s at the outermost edge of the disc, if we assume CAV (constant angular velocity). This is untrue. See Blu-ray_Disc_recordable#Speed. CDVDBD 💿 📀 13:39, 16 November 2024 (UTC)[reply]

RE how many times

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How many times can the BD-RE rewritable disc be rewritten? Article only says "multiple" but there must be a practical limit. ---Ransom (--67.91.216.68 (talk) 22:30, 29 May 2013 (UTC))[reply]

Presumably it depends on too many different factors to be able to quantify. Hence "multiple". 92.40.249.142 (talk) 12:05, 20 November 2015 (UTC)[reply]
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Move to “Blu-ray recordable”

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Since the Wikipedia article/page for Blu-ray is now called “Blu-ray” instead of “Blu-ray Disc,” shouldn’t this article/page be called “Blu-ray recordable” instead of “Blu-ray Disc recordable”? --Fladoodle (talk) 20:30, 22 November 2021 (UTC)[reply]

The "Disc" is part of its official name. On the main "Blu-ray" article, there is confusion due to the distinction between the physical disc and the logical movie format, since movies are a major use for Blu-ray discs. See Talk:Blu-ray#Misleading_information_involving_video_formats. This will eventually have to be resolved. CDVDBD 💿 📀 13:43, 16 November 2024 (UTC)[reply]

Confusion over one of the categories on this Wikipedia article/page

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One of the categories on this Wikipedia article/page is “Audiovisual introductions in 2002,” but Blu-rays weren’t invented until 2006. --Fladoodle (talk) 21:57, 22 November 2021 (UTC)[reply]

 Done. From what I understand, 2002 was when the first generations of Blu-ray specifications were finished, but indeed, Blu-rays first appeared on the market and got into the hands of end users in 2006 (along with HD DVDs), so 2006 is more significant than 2002. I have changed it to 2006 for now. I ask who objects to it to provide a reason. CDVDBD 💿 📀 19:14, 2 November 2024 (UTC)[reply]

BD-RE formatting and BD defect management

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I see some need for correction in two paragraphs. First paragraph:

"Note: Add extra time for disc verification phase."

As the next paragraph "Write verification ..." in the wiki page states, the verfication happens during writing and halves write speed. Any verification phase after writing is a matter of burn software, not of the drive.

"Like on DVD+RW, pre-formatting the entire disc is not necessary for sequential writing but only if random writing is desirable on media that was never previously written to.[23]"

This is not true. BD-RE must be formatted before use. It's BD-R which can be used unformatted for sequential writing. (Actually DVD+RW need formatting, too. But this can be done together with writing after the burn program issued a background FORMAT command.)

"[23] xorrecord - man pages section 1: User Commands It is not mandatory to do this with DVD+RW and BD-RE media, because they will get formatted automatically on the first write attempt."

I am the author of this man page. Automatic formatting of BD-RE before the first write attempt is a feature of xorriso and other burn programs, not of the burner drives.

I would rephrase the "Note:" paragraph like: 

 Note: Unlike with CD-RW there is no need for blanking BD-RE before re-use.
 But they need to be formatted before first use. Burn programs usually
 detect the unformatted state and automatically format the medium
 before beginning to write,

Next paragraph:

"Write verification is a feature new to the Blu-ray format."

This feature was introduced by the Mount-Rainier format for older media like DVD+RW. 

 https://en.wikipedia.org/wiki/Mount_Rainier_%28packet_writing%29

It is the default behavior of DVD-RAM, BD-RE, and formatted BD-R.

I would rephrase the paragraph like: 

 Write verification is a feature of formatted BD media, officially
 called "Defect Management". If not deactivated, the correctness of the
 written data is verified immediately after being written. Poorly readable
 data can be written again to an area of spare blocks. In this case, the
 writing speed is halved because only half of the disc rotations are for
 writing. Defect management can be deactivated by burn programs using
 a feature called "Stream Recording" which enables full nominal write speed. 
 Whether defect management is beneficial with mediocre media depends much
 on the individual medium and the drive's firmware. It works well with
 narrowly located bad spots but tends to fail more often than stream
 recording if the drive perceives reduced read quality on the whole medium.

As developer of xorriso i use stream recording with all bulk write runs which fill a whole BD-RE medium and with all write runs on BD-R. I leave defect management activated only with incremental multi-session backups on BD-RE.

Thomas Schmitt, author of xorriso.

Hello, Thomas. It is good to have you here. Your input is precious. I will see how I can implement your proposed changes. Regards, CDVDBD 💿 📀 06:13, 12 November 2024 (UTC)[reply]
Quote:

This is not true. BD-RE must be formatted before use. It's BD-R which can be used unformatted for sequential writing. (Actually DVD+RW need formatting, too. But this can be done together with writing after the burn program issued a background FORMAT command.)

As I understood from the xorriso manual ("It is not mandatory to do this with DVD+RW and BD-RE media, because they will get formatted automatically on the first write attempt."), it would be technically possible to violate the BD-RE standard and force writing data to a never-written BD-RE. But it looks like this was a misunderstanding. Thanks for your clarification. I am implementing your suggestions. CDVDBD 💿 📀 21:22, 12 November 2024 (UTC)[reply]


Quote:

This feature was introduced by the Mount-Rainier format for older media like DVD+RW. It is the default behavior of DVD-RAM, BD-RE, and formatted BD-R.

I should clarify that BD-R is the first write-once media to have write verification (defect management). The other media that had that were all rewriteable. CDVDBD 💿 📀 21:26, 12 November 2024 (UTC)[reply]
I like the changes you made.
But there is a typo "blocksm" <-> "blocks" in the most recent one
https://en.wikipedia.org/w/index.php?title=Blu-ray_Disc_recordable&diff=prev&oldid=1257032486
Thomas Schmitt, 2003:C6:1F34:D570:6CE7:3A4B:3A0E:F1C1 (talk) 14:53, 13 November 2024 (UTC)[reply]
I have fixed it. If you want, you can edit it yourself too. Thanks for noting it. CDVDBD 💿 📀 10:53, 16 November 2024 (UTC)[reply]
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