Re: LaserDisc
By: Nightfox to Android8675 on Wed Oct 09 2019 16:12:44

Laserdiscs had 2 formats CAV (Constant Angular Velocity - Spins at
one speed, hold 30 minutes per side), and CLV (Constant Linear
Velocity - Spins at variable speeds (Slower on the outside) to hold
an hour of video per side).

CAV was supposed to be less compressed/sharper. I had a limited
edition Blade Runner that was 6 discs, 12 sides.

Aside from cost, I think that was another problem with the Laserdisc format: It didn't hold very much, at 1-2 hours per disc. Having to keep flipping and swapping discs to get through a movie would be a little annoying. Most DVDs and blu-ray discs can store an entire movie on one disc, unless the movie is an unusually long movie. I think Titanic spans 2 DVDs, though I think blu-ray can hold the entire movie.

Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo, they (whoever was developing next gen LD stuff at the time) was working on a way to improve both the density of the data as well as adding layers to the discs. So given enough time Laserdiscs would of did what Bluray did for DVD. I believe that's all in theory.

Here's another fun tidbit, laserdiscs spin fast enough that if you were to "eject/launch" a disc while spining it could (in theory) embed itself into drywall. (Dont quote me on that, I probably misheard this)

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Re: LaserDisc
By: Android8675 to Nightfox on Mon Mar 09 2020 13:23:23


Android8675> Here's another fun tidbit, laserdiscs spin fast enough that if you
Android8675> were to "eject/launch" a disc while spining it could (in theory)
Android8675> embed itself into drywall. (Dont quote me on that, I probably
Android8675> misheard this)

you didn't hear wrong... CD/DVD can do this, too... i've done it manually throwing them just like we used to do when we practiced with shuriken... coming out of a tray, though, is a bit tricky...

we'd get a piece of sheetrock, stick it up on a frame with a few nails, trace a silhouette of one of us on it, and then start throwing at specific target areas until the board was pretty much eaten all up... we're talking about maybe max 20 foot range... one of my best shots was a turn around shot where i stood with my back to the target, turned, and threw in one motion... deadly accurate most every time... didn't matter if it was a hand, knee, head, or heart shot... we'd spend hours doing this... it was quite fun back in the day when we weren't out riding our boards in some empty pool, running downhill races off the mountain, or playing hacky sack for hours on end :)


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Re: LaserDisc
By: Android8675 to Nightfox on Mon Mar 09 2020 01:23 pm

Here's another fun tidbit, laserdiscs spin fast enough that if you were to "eject/launch" a disc while spining it could (in theory) embed itself into drywall. (Dont quote me on that, I probably misheard this)

I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

DaiTengu

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Re: LaserDisc
By: DaiTengu to Android8675 on Mon Mar 09 2020 19:40:30

Here's another fun tidbit, laserdiscs spin fast enough that
if you were to "eject/launch" a disc while spining it could
(in theory) embed itself into drywall. (Dont quote me on

that, I probably misheard this)

DaiTengu> I'm not sure how you'd transfer rotational kinetic
DaiTengu> energy to lateral kinetic energy...

the edge can catch on something in the tray and eject the disc laterally... it doesn't happen so much these days but one way it used to be possible was to use a paper clip and push the manual eject you would use if the drive had no power... especially if a disk is not fully balanced... once the door/tray open, the center hub isn't holding the disk in place and it can/could come out... i think there's a brake incorporated these days to stop the disk before the door opens...


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On 03-09-20 19:40, DaiTengu wrote to Android8675 <=-

I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

Same way jet engine turbines do it - spin it fast enough for the disc to shatter. :D

Example: Qantas QF32 (A380) several years ago. :)

https://en.wikipedia.org/wiki/Qantas_Flight_32

I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can use much greater rotational speeds than the original specs required.


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Android8675 wrote to Nightfox <=-

Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

It was a pretty crappy format, but I think you meant "Dodo".





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Re: LaserDisc
By: DaiTengu to Android8675 on Mon Mar 09 2020 07:40 pm

I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

You wouldn't just being funny.
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Re: Re: LaserDisc
By: poindexter FORTRAN to Android8675 on Tue Mar 10 2020 06:30 am

Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

It was a pretty crappy format, but I think you meant "Dodo".

Ha, though I'm pretty sure I got it right. Either way...
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Android8675 wrote to Nightfox <=-

Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

It was a pretty crappy format, but I think you meant "Dodo".

Or maybe he just meant if they had not got flushed down the toilet.. :)


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ANDROID8675 wrote to NIGHTFOX <=-

Here's another fun tidbit, laserdiscs spin fast enough that if you were
to "eject/launch" a disc while spining it could (in theory) embed
itself into drywall. (Dont quote me on that, I probably misheard this)

Thought you were going to say "don't quote me on that - only happened once!"




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VK3JED wrote to DAITENGU <=-

I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can
use much greater rotational speeds than the original specs required.

I broke one once - turned a tower over on its side while the CD/DVD
was spinning! Don't know if it was a fluke or not, but I never did
it again!!!




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On 03-10-20 10:05, JIMMY ANDERSON wrote to VK3JED <=-

I broke one once - turned a tower over on its side while the CD/DVD
was spinning! Don't know if it was a fluke or not, but I never did
it again!!!

Haha sounds like the gyroscopic effect at play. :D


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Re: Re: LaserDisc
By: JIMMY ANDERSON to VK3JED on Tue Mar 10 2020 10:05 am

VK3JED wrote to DAITENGU <=-

I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can use much greater rotational speeds than the original specs required.

I broke one once - turned a tower over on its side while the CD/DVD
was spinning! Don't know if it was a fluke or not, but I never did
it again!!!

yeah i did the exact same thing. was pretty scarey

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