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DVD Idle

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DVD Idle

Postby TheMule on Sun Dec 21, 2003 3:34 am

Greetings,

I came across a program called DVD Idle that supposedly increased your DVDs lifespan by offloading whatever its reading into a smart cache, and thus save wear and tear on your drive. Any truth to that? Do said type programs actually work?


Thanks,


-TheMule
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Postby NoSmartz on Sun Dec 21, 2003 11:02 am

Never heard of it.Can you post a site link to it?
there is dvd idle which is DVD Region Free.

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Postby TheMule on Sun Dec 21, 2003 12:37 pm

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Postby NoSmartz on Sun Dec 21, 2003 1:03 pm

I have this app to rip with Recode 2 and CloneDVD.I know it works with these 2 apps very well as a css decrypter,but as far as Cache'g to watch a movie and saving your ROM drive,I haven't tried it for that purpose.I watch all my flix on a Home DVD player.It's a great app for Decrypting CSS though,no doubt about it. :D



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Postby cfitz on Sun Dec 21, 2003 2:27 pm

I wouldn't recommend buying this product for the cacheing feature. Despite DVDIdle's claims that it will increase the lifespans of your DVD drive and DVD discs, in reality it will decrease their lifespans.

Based on their description, this application rips the DVD at the maximum speed supported by your drive and stores the data on your hard drive for later access when you need it. In their example they say a 90-minute DVD you are watching will be read from the drive in only 15 minutes at 6x speed, so that the drive can "rest" for the remaining 75 minutes rather than spinning the entire 90 minutes. At first glance that might appear to be a reasonable argument - the drive is only in use 15 minutes instead of 90 minutes, so you have saved 75 minutes of wear and tear. But a little critical thinking quickly debunks this claimed "savings".

The first two problems that immediately pop into my mind are that in order to use this you must have 4.7 GBytes of free space on your hard drive (not too big a deal these days for most people) and that during the first part of your movie you will be assaulted with the noise of your drive ripping at full speed (not necessarily a trivial noise, as owners of 166S drives can attest).

The more fundamental problem, however, is that the energy required to spin a disc is a non-linear function of speed. The primary force acting against the drive's motor is the air resistance on the spinning disc. Although calculating air resistance as a function of speed is a non-trivial undertaking, a good first approximation for assumed turbulent flow is that the force goes as the square of the speed.

Let's use your new 166S as an example. If you have a single-layer DVD disc it can rip at 16x CAV. That means that the force exerted agains the spinning disc is 256 times as great as at 1x. Force times distance equals energy, so for each revolution of the disc your drive has to supply 256 times the energy at 16x as at 1x. And whether or not you rip at 1x or 16x, your drive still has to turn the disc the same number of times. Thus, with DVDIdle at work you are forcing your drive to expend 256 times the energy to read that one DVD than if you let it just lazily read at 1x!

But wait, it gets worse! At 16x the drive is taking roughly 1/8 the time to read the disc (remember it is 16x CAV, not CLV), so that 256 times as much energy must be delivered and dissipated in 1/8 the time. In other words, the power is multiplied by 8, so that now your drive must supply 1024 times the power at 16x compared to 1x! :o Ouch! After all that, your drive really will need a "rest".

So, in addition to the much greater forces, the drive has to dissipate much greater power which leads to much greater heat build-up, and heat is one of the big enemies of long life. Try it for yourself. Play a disc at 1x for an hour, then remove it from the drive and feel how warm it is. Then rip the disc at 16x, remove it and feel how warm it is.

A similar agrument applies to the disc itself. It gets hotter, and the forces and stresses applied to it are 256 times as great. On the whole I would say the disc would be less affected than the drive, but still...

In summary, DVDIdle's claim to fame is bunk. It does just the opposite of what it claims to do, and will actually shorten the life of your drive. Even if its claimed benefits were true, you would have to ask yourself whether or not they would be worth the price. At $30 for a new OEM 166S, does paying $20 to theoretically extend its life make much sense?

Whether or not DVDIdle is worth buying for its other features I don't know. NoSmartz says he likes it for decrypting, but there are free apps that will do that as well.

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Postby TheMule on Sun Dec 21, 2003 9:37 pm

Wow!

Thanks for all the great information, I certainly won't be investigating that program any further.


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Postby dodecahedron on Mon Dec 22, 2003 3:35 am

did i miss something here or make a trivial mistake?
256*8=2048? power is increased by a factor of 2048?
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Postby TheMule on Mon Dec 22, 2003 4:04 am

Possibly,

To be honest I didn't really do the math. I took the lazy and cowardly way out by not doing the math myself and took his word for it by his volumous post.


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Postby aviationwiz on Mon Dec 22, 2003 12:19 pm

TheMule wrote:Possibly,

To be honest I didn't really do the math. I took the lazy and cowardly way out by not doing the math myself and took his word for it by his volumous post.


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Postby dodecahedron on Mon Dec 22, 2003 12:30 pm

aviationwiz wrote:A Lazy Mathematician is a good Mathematician.

how very true! :D
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Postby cfitz on Tue Dec 23, 2003 7:58 pm

These mathematicians are certainly a picky lot. A factor of two would go without notice or comment by engineers, but the mathematicians get all out of sorts... :wink:

Yes, dodecahedron, it was just a stupid error. I was fixated on the need to account for the CAV average value being less than its maximum, and ended up dividing twice. Which brings up another issue that someone should have pointed out: the average transfer speed for a DVD 16x CAV transfer is about 12x, not 8x. So the correct power value should be yet 50% higher still (someone please check that math 8) ).

I also left out arguments about laser usage, which likely also requires higher power, although it could depend on the specifics.

My discussion wasn't meant to present strictly accurate figures. I was just doing a back-of-the-napkin calculation to estimate orders of magnitude. And the point remains valid - stressing the drive to its maximum limits is not the way to extend its life. It's somewhat analogous to a car. Which car do you think will last longer, the car that is driven full tilt by a teenager to school every day while the engine is redlined at 7000 RPM / 120 mph, with side-step, full throttle drop-clutch starts and locked-brake screaching stops, or the one gently and smoothly driven by the little old lady at 40 mph for 45 minutes to daily prayers? Yeah, the teenagers car is only used 1/3 as much, but...

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Postby dodecahedron on Tue Dec 23, 2003 8:52 pm

LOL
i wasn't concerned about the particulars of the mathematics.
yeah, i did notice that the average isn't 8x, it's not all important.
you made your point.

i just mentioned it because i thought i might have missed something, not to criticise your maths :wink:
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