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Is this article a stub? —Preceding unsigned comment added by 4.142.231.135 (talk • contribs) at 04:57, 31 July 2005 (UTC)
Optical disc can be loaded with tray or slot-in thingymabob. —Preceding unsigned comment added by Frap (talk • contribs) at 15:01, 6 June 2006 (UTC) With an ODD on my laptop and other than buying an external CD drive, how do I get my original CDs' programs loaded? 68.201.92.229 14:07, 3 November 2007 (UTC) Olde Dave
In my Computer Information Systems class we were told that there are two types of optical disks, the CD and the DVD. Now I'm reading this article and I'm like what the hell? Not that I trust my class over wikipedia. Obviously. Erik E. 02:20, 13 February 2007 (UTC)
James T. Russell or David Paul Gregg ?--218.102.200.15 06:01, 11 October 2007 (UTC)
I do not think that classifications in generations explains the readers much. why not simply write CD, DVD etc. This tendency to classify products into generations seems to be a typical trait of the English Wikipedia which is fortunately not so strong in other Wikipedias. Andries (talk) 17:17, 26 January 2008 (UTC)
Is PlayStation a toy, isnt more like a game console, i didnt know 30 year olds played with toys...the word should be change to PlayStation Game Console instead of "PlayStation Toy"EdwinCasadoBaez (talk) 03:57, 6 June 2008 (UTC)
Down where it talks about the blu-ray read speed it says 12x but the referenced article only talks about 6x. Could someone who knows more about this either fix it or explain why it's that way?
72.220.68.143 (talk) 08:58, 18 July 2008 (UTC)
Since when has the English language changed the spelling of "disk" to "disc"? OK, I recognise that Philips/Sony took out a trade mark for "Compact Disc", as they wanted their trade name to sound international and groovy. But for non-trade names, we really should use the plain English word "disk", as it is in every English dictionary. "Optical disc", the article title, is not a trade name. It should be changed to "Optical disk".--Lester 22:26, 2 September 2008 (UTC)
"The optical disc was invented in 1958."
Uhhh, no. Gilbert King was leading development of a read-only optical disk system at International Telemeter starting in 1953. They made numerous devices during development. After moving to IBM in 1958 he delivered a real working system to the Air Force in 1959, and by "working system" I mean a complete online data system with computer, disk, etc. My guess is that there were even earlier attempts, but I can't demonstrate that. What I can demonstrate is...
G.W. King, G.W. Brown and L.N. Ridenour, "Photographic Techniques for Information Storage", Proceedings of the IRE', Volume 41 Issue 10 (October 1953), pp. 1421-1428
Ridenour, BTW, was one of the co-developers of the SCR-584.
Maury Markowitz (talk) 19:03, 20 January 2009 (UTC)
ARE THIS OPTICAL DISC DESTROYED WHEN KEPT IN HIGH MAGNETIC FIELD?? —Preceding unsigned comment added by 67.193.111.132 (talk) 21:04, 26 March 2009 (UTC)
Comment: The discussion to ignore the prior inventions/products is nonsense. Rather, we should verify and correct the description, following the advice of the ((Original research)) tag. The analog optical disc based on sound film technology (one of the photographic techniques) was already put in practical use in Germany in 1930s, and it was re-invented in the United States after the WWII. Such re-inventions may be found in many other fields: for examples, modern electronic computers, microprocessors (half dozen of rivals had invented at that time), magnetic tape recorders, etc. --118.8.51.203 (talk) 04:02, 26 April 2011 (UTC)
The result of the proposal was No move Parsecboy (talk) 01:35, 16 April 2009 (UTC)
Computer specialists preferred the familiar k-spelling, while people in the music industry, who saw the shiny circular plates as another form of phonograph record, referred to them as compact discs. These tendencies soon became established practice in the different industries. This is why we buy compact disks in computer stores but get the same storage devices with different data as compact discs in music stores. Similarly, the computer industry created the optical disk, the format that the entertainment industry used to create the videodisc. [1]
** Blu-ray Disc (BD): BD-R, BD-RE ** DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-RW, DVD+RW, DVD-RW DL, DVD+RW DL, DVD-RW2, DVD-RAM, DVD-D ** Compact Disc (CD): Red Book, CD-ROM, CD-R, CD-RW, 5.1 Music Disc, SACD, PhotoCD, CD Video (CDV), Video CD (VCD), SVCD, CD+G, CD-Text, CD-ROM XA, CD-i, HVD ** VCDHD ** GD-ROM ** MiniDisc (MD) (Hi-MD) ** Laserdisc (LD) ** Video Single Disc (VSD) ** Ultra Density Optical (UDO) ** Universal Media Disc (UMD) ** Holographic Versatile Disc (HVD)
Facts707 (talk) 13:46, 11 April 2009 (UTC)
Last modified: Sunday, September 01, 1996 Alternative spelling of disk . Disc is often used for optical discs, while disk generally refers to magnetic discs, but there is no real rule.
optical disc computer technology Aspects of this topic are discussed in the following places at Britannica. Assorted References ===major reference ( in information processing: Recording media ) An entirely different kind of recording and storage medium, the optical disc, became available during the early 1980s. The optical disc makes use of laser technology: digital data are recorded by burning a series of microscopic holes, or pits, with a laser beam into thin metallic film... === information storage ( in computer memory: Optical discs;
Another form of largely read-only memory is the optical compact disc, developed from videodisc technology during the early 1980s. Data are recorded as tiny pits in a single spiral track on plastic discs that range from 3 to 12 inches (7.6 to 30 cm) in diameter, though a diameter of 4.8 inches (12 cm) is most common. The pits are produced by a laser or by a stamping machine and are read by a... ... Facts707 (talk) 19:45, 12 April 2009 (UTC)
This says that flash memory is more reliable. Flash memory only lasts about 10 years - hardly reliable. Optical discs can last up to 100 years or more (for high-end brands, eg. Taiyo Yuden or MAM-A). —Preceding unsigned comment added by 174.111.242.33 (talk) 21:53, 26 October 2010 (UTC)
A long time ago (early to mid 90's?) I recall seeing a bit in a magazine (Popular Science?) about a business card size optical "disc" that didn't spin, but was read without moving parts and the surface looked like and was shiny just like CD's and DVD's. In fact, were a CD or DVD cut precisely and cleanly into a rectangle (obviously smaller than an actual business card as the central hub would be part of such a disection) it would look just like what I saw. Google searches turned up nothing resembling this and it wasn't a bootable business card or Shaped Compact Disc. Maybe I'm just remembering this incorrectly and/or didn't understand what it was I was looking at, but should this have existed (Is solid state optical media even possible or is spinning a necessity?), would it warrant a mention? —Preceding unsigned comment added by 4.254.86.87 (talk) 01:02, 14 February 2011 (UTC)
Got it. It was called the Hi-Lite Card, was larger than I thought-the size of a business card-and held 200MB. Impressive for 1987. I did read about it in Popular Science and actually still own that particular issue, but didn't find the article until now since all the issues are now available on Google books. Anyway, it was an example of solid state optical media and I wonder why it or anything like it never caught on. — Preceding unsigned comment added by 4.254.82.197 (talk) 00:00, 4 June 2011 (UTC)
What is going on with this one? The whole second half reads like a cross between an ad for blu-ray and a badly copypasta'd high school book report. — Preceding unsigned comment added by 66.87.91.3 (talk) 05:16, 21 October 2011 (UTC)
It seemed someone had rediscovered the earliest known optical disc invented in Volta Laboratory Associates through Smithsonian archives.[3] 142.150.48.218 (talk) 00:23, 20 December 2011 (UTC)
In the lead we have "The pits or bumps distort the reflected laser light, hence most optical discs (except the black discs of the original PlayStation video game console) characteristically have an iridescent appearance created by the grooves of the reflective layer." This sounds pretty impressive but it is actually wrong. If you look at a blank CD-R, you will see the same iridescent appearance (rainbow look) regardless of the fact that there are no "pits or bumps" since no recording has taken place. More disturbingly, the above sentence contains a link to Iridescence which correctly identifies Thin-film interference as the "physical phenomenon" taking place. A lucid explanation of the physics involved can be seen here. CaesarsPalaceDude (talk) 01:31, 4 October 2014 (UTC)
Here are some sources:
Thin-film iridescence:
Diffraction:
((cite book))
: |first1=
has generic name (help)Seems to me the balance is in favor of diffraction, though mostly from educational sources, not pure science ones. That last book, however, is a much more pure-science type source. 0x0077BE [talk/contrib] 15:01, 8 October 2014 (UTC)
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i dont understand this generations thingie. there are no sources that characterise the laserdisc, cdrom, dvdrom or blueraydisc as different generations. it makes no sense at all. original research? Maria Kappatou (talk) 02:45, 3 November 2016 (UTC)
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USB drive 103.167.162.150 (talk) 15:01, 20 May 2022 (UTC)
The article claims that "Malware is unable to spread over factory-pressed media, finalized media, or -ROM (read-only memory) drive types whose lasers lack the strength to write data. Malware is conventionally programmed to detect and spread over traditional mass storage devices such as flash drives, external solid-state drives and hard disk drives." with a citation. However, the Sony BMG copy protection rootkit scandal involved software that was spread via CDs produced by Sony. Is there a better source for the claims made or should it be rewritten or removed? Autarch (talk) 11:42, 2 July 2024 (UTC)
Malware is conventionally programmed to detect and spread over traditional mass storage devices such as flash drives, external solid-state drives and hard disk drives.As for the part you quote, generously, it depends on what is meant by spread. If a computer has a virus, it can't be transmitted to another computer by inserting the described removable media into the infected computer then moving it to the uninfected computer. ~Kvng (talk) 16:40, 5 July 2024 (UTC)