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You're assuming a couple things. Allow me to assume some different ones.

They use a standard T120 http://www.high-techproductions.com/video1.htm and do indeed get 2 hours per tape in NTSC format.

But they're not crazy, so they have 2 recorders. For the first hour, they start both recorders. Starting with the second hour, they replace the first tape, leaving the first tape with only an hour. On the third hour, they replace the second tape. 4th hour, first tape again, etc, etc.

This leaves them with 26 tapes for a 24 hour period, 2 of them with only an hour. (First and last) It guarantees that no piece of the sequence is lost when the changeover occurs, and provide a little redundancy.

It's also possible that they used 3 recorders and overlapped a little on the change, and used less than 1-hour rotations, to allow any single tape to be lost or damaged, as well.

Cuz if you spend 24 hours reciting numbers to get in the Guiness Book... You'd damned well better get it on tape.

I don't know that this is how they did it, but it's my theory. They'd be crazy to do less... But then, they recited numbers for 24 hours. So...

100 gigabits per square inch capacity for magnetic media

One day my old vhs tapes could store all of my pr0n?

Let me see my old T160 at 1075 feet * 12" * .5" wide * 100 gig * ... Well maybe two tapes. And you thought no one was going to manufacture the T200 because the tape was dead - Ha I say; dont underestimate the power of...well you know.

cause if they don't, there won't be businesses like: Transfer your Betamax Videos to DVD. this way, when we don't have any more IT jobs, we can convert one DVD types to another DVD types...

CB$#@#$@

Here are some links to the history of television.

It is the coil that surrounds the tube as this is often driven with a signal of frequency 15.734 kHz (US) and 15.634 kHz (UK). This is the "Horizontal Scan Frequency". ( got this information information from here )

This is right on the edge of human limits, some can hear it, some cannot. When I was a kid, I used to be able to sense that a TV was on, and couldn't understand how I could do it. Don't seem to be able to do it these days though.

Increasing this scan frequency by upping your refresh rate on the monitor should get rid of this annoyance if the monitor can do it - putting the scan freq well beyond your hearing ( here in the UK you can get 100Hz TVs that you will not hear. Presume you can get 120Hz NTSC ones ?)

Yes, Sony made Betamax (an excellent standard for monoaural audiovisual entertainment) and U-MATIC. Phillips made System 2000 (or Video 2000), while JVC Japan came up with VHS, which through deals with the movie industry ended up being the most popular and wide spread, although not necessarily the best system from a quality standpoint.

DVD+R is the one approved by Sony
DVD+R/+RW is better technically

So was Betamax, but all you hear about it now is because of the legal precedent.

At the office, we've got 3 Pioneer A04's & A05's, a Mac with a Superdrive (an A04 in a different casing), and the new Sony dual format drive. That's 5 "-" drives, and one of them does "+".

Methinks there's a defacto standard.

SECAM is used by these countries.

NTSC is used by these countries.

PAL is used by these countries.

--Mike

SECAM is used by these countries.

NTSC is used by these countries.

PAL is used by these countries.

--Mike

SECAM is used by these countries.

NTSC is used by these countries.

PAL is used by these countries.

--Mike

The Beta that is still used in "the entertainment industry" (I think you mean "broadcast television") is BetaCam and BetaCam SP.

BetaCam and BetaCam SP are NOT the same as BetaMax. BetaMax is a watered down version of BetaCam and was geared towards home use. For all practical purposes BetaMax and VHS were identical in quality.

You might find the following format guide of interest.

http://www.high-techproductions.com/formats.htm