Talk:Magnetic tape

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Predecessor: Iron wire[edit]

Shouldn't there be a mention about the predecessor, iron wire? Kwantus (Nevermind, it's under reel-to-reel.)

Article needs to include more information on the many materials used for the tape itself, and specially for the magnetic coating; as well as information on the protective coatings, information on the deterioration mechanisms and more on the aging of tapes. Common tape widths and lenghts are not included. Audio "Print-through" is not mentioned also. As it is now, the page is very incomplete. amclaussen.[edit]

There should also be mention of capacities that have been recently achieved - LTO-3, 800GB compressed. -Tapeman (16:24, 17 March 2005)

Image:Magnetic tape.jpg has been listed for deletion[edit]

An image or media file that you uploaded, Image:Magnetic tape.jpg, has been listed at Wikipedia:Images and media for deletion. Please look there to see why this is (you may have to search for the title of the image to find its entry), if you are interested in it not being deleted. Thank you. 15:55, 15 December 2005.

6250 bpi, 3200 bpi[edit]

Anyone have information on the recording techniques used for 6250 bpi and 3200 bpi 9-track tapes? The 3200 format is described as "Double Phase Encoding"; I think it may be the same as 1600 only denser (as some tape drives can do 3200 bpi) but I'm not sure. The 6250 format is called GCR, but in this case that's an error-correction code. I'd like to know what the actual recording technique was (NRZi, maybe?). One reference states that a 6250 bpi tape had over 9000 flux transitions per inch, but the numbers don't add up for either PE or NRZi (6250 * 8/7 = 7142 takes the error correction code into account if it's NRZi). There's an ANSI standard (X3.54) but I'm too cheap to buy it for curiosity's sake. Nybbler 20:21, 2 March 2006 (UTC)

Nevermind... found it. It's RLL(0,2), which is a rate 5/4 code. And 4 synchronization codes are inserted every 316 data codes, which gives 6250 * 8/7 * 5/4 * 320/316 = (approx) 9042. Nybbler 15:33, 6 March 2006 (UTC)

Removing Link[edit]

I am looking for information about the process of magnetic recording. What I get when I click on this link (at "Guitarz-for-ever"), besides advertisement links, direct product links, and links for "Eddie Van Halen" and "Motivation to Acheive Success", is seven basic paragraphs on the evolution of recording. If there is any appropriate information, i.e. information concerning the subject of this encyclopedia article, it is not directly accessible. Renfield 16:08, 19 June 2006 (UTC)

Tape vs disk[edit]

"Tape remains a viable alternative to disk due to its higher bit density and lower cost per bit" -- These tend to be true only for narrow usages these days. The article currently seems to have a wide scope but a narrow focus, which results in it being slightly misleading. — Preceding unsigned comment added by 24.182.109.10 (talk) 07:39, 11 July 2006

Error[edit]

In the table of tape formats, there is an error: Dectape II is NOT a 3/4" format! It used a preformatted DC150 cartridge, a baby brother to the QIC (aka DC300). I don't know exactly what size the tape was but it was on the order of 4mm or 1/8". I don't know how to edit this common table. Jeh 02:28, 18 August 2006 (UTC)

Video recording: "Live" time-shifting[edit]

An IP editor inserted the following after the article's mention of "live" time-shifting possible with digital video recording:

(? What does this mean? VCRs can time shift on-the-fly, so it can't mean that. 
Is it referring to play-while-record?)

Yes, it is. As I noted in the edit summary, "instant replay" was an early example: Play back an earlier portion of the recording while continuing to record live. Perhaps a better word or term can be found here than "live time-shifting". And I might as well also mention that "instant replay" isn't really the best example, either, because that was first done with an analog video disc recorder such as an Ampex HS-100. Jeh (talk) 05:13, 23 September 2008 (UTC)

BTW, to the IP editor: Please don't insert questions in the visible text in the article. Embedded comments ( <!-- --> ) will get the attention of anyone watching the article but won't bother readers. Or, you can use the article talk page. Thanks! Jeh (talk) 05:32, 23 September 2008 (UTC)

Imation note at end[edit]

The note about Imation is kind of silly. Imation, formerly 3M, was once a major force in magnetic tape, but times have changed. Citing a government grant that happened 6 years ago just doesn't seem to meet the notability threshold. The reference has more then just the grant in it, but it is also at least 5 years old and Imation has changed focus in that time. --Austin Murphy (14:29, 7 October 2008)

Additional citations[edit]

Why, what, where, and how does this article need additional citations for verification? Hyacinth (talk) 08:09, 26 June 2011 (UTC)

Dates missing entirely[edit]

All history is next to useless w/o dates. At least a year *when* something happened. But I see nada here. --jae (talk) 18:19, 15 January 2012 (UTC)