Rod Speed ha escrito:
lsmartino wrote
Check the datasheet of any semiconductor
and learn something before you write.
I was doing that likely before you were even born thanks.
Any rise in the temperature will shorten the lifespan of the product.
Wrong when the life is indefinite at any temps that the product will ever see.
To me, thatīs a quite profitable scenario.
Thanks for that completely superfluous proof that you have never ever designed a TV.
Would you care to show us how many TVīs have you designed? Answers
like: "many more than you can buy in your entire lifetime", "a lot
before you where born" arenīt valid ones. Give us real models and
brands if you want to have a little credibility. Probably you will not
ba able to produce a valid answer
Also, you will notice that the same circuit will have electrolytic
capacitors near heat sources, when itīs a well known fact that
heat shortens dramatically the life of electrolytics caps.
In practice that isnt a significant problem with domestic appliances.
Essentially because you dont see many electros in that situation with them.
Are you crazy?
Nope.
Have you ever seen a modern SMPS?
Yep, I may well have been using them since before you were even born too thanks.
Try to tell all us that a SMPS (Switched Mode Power Supply, in case
you donīt know what a SMPS is) donīt HAVE electrolytics caps,
I never ever said anything even remotely resembling anything like that.
and that those caps doesnīt have a finite lifespan.
Or that either.
Even electrolytics are classified based
on their MBTF at certain temperatures.
Duh.
Again, try to find the datasheet of some electrolitycs caps,
Dont need to, did that likely before you were even born too thanks.
and educate yourself.
So no comments about how the finite lifespan of a capacitor used in a
SMPS will affect the overall lifespan of the product?
The manufacturer know how to properly design an electronic
circuit in order to provide a long life, but it also it knows how
to design it to fail within a short term under certain conditions,
No they dont on that silly claim about surviving the
warranty fine, but failing immediately after that expires.
No one is telling that the product will explode right after the warranty expires,
Some have run the mindlessly silly line that it can
be designed to fail just after the warranty runs out.
but that it can be designed to fail within a
short life span, especially with cheap products.
Have fun explaining the host of domestic electronic devices that dont.
I say "it can be designed to have a short life span", not that "all
electronic devices are made to fail". Iīm starting to think that you
have trouble to understand written language.
A TV, or a computer monitor left on all the time will last less time
of course. A CRT has a definite lifespan, and if the monitor or the
TV set is a LCD based one, the CFL bulbs used to light up the screen
have a definite lifespan. Did you knew that, Mr. Know Nothing ?
Corse I did, Master Pathetic Excuse for a Bull**** Artist.
Pity its got nothing to do with your stupid pig ignorant claim
that is possible to design a product to survive the warranty
period and die shortly after that expires, with so much
variation in the detail of how domestic appliances are used.
Since you donīt have a real argument, you proceed to personal
disqualification. Thatīs says a lot about you. Try to tell us that
leaving a device turned on always will not reduce itīs lifespan
considerably. In fact, following your ideas that no real lifespan can
be determinated for a given device, then the amount of use of that
devices shouldnīt have any impact.
The claim is completely fanciful and those making that sort of
claim have obviously never actually designed a damned thing.
And only the stupidest manufacturer would deliberatly design
their product to die as soon as the warranty has expired
anyway, because the bulk of those who had bought such
a dud wouldnt be buying another from that manufacturer.
Tell that to the manufacturer of Coby products, for instance.
Dont need to.
They have quite a long time selling trash that fails quite quickly.
Because there are enough who havent been dudded
with a product of theirs to buy a dud of theirs.
Basic mathematics.
And they are the masters about producing disposable electronics. They
are the vivid proof that a device can, and sometimes is, designed to
fail within a short time.
It can be something like 15 years or more of constant use, without a stop.
Its actually a hell of a lot more years than that.
And I have seen hard drives surviving at least more than 10 years of hard work.
Me too. Pity about the years the MTBF turns into.
Check this link
http://www.samsung.com/Products/Hard...tePaper_05.htm
It shows how MTBF is calculated.
specially those concerning the maximum number of startups/stops
the drive can tolerate before the heads get completely worn.
Wrong again. Its such a round number it cant have been produced
by TESTING, and the number of starts and stops dont produce
any wear of the heads with modern hard drives anyway.
You are wrong again.
Nope.
When the platters stops, the heads contact the platters.
Not anymore, they are retracted now.
While the platters are spinning at full speed, the heads are separated from
them by a small air cushion formed by the rotational speed of the platter.
Duh.
As soon the HDD is turned off, the platters loses speed, and eventually
the air cushion dissapear, thus the heads make contact with the platters.
No they dont, they are retracted now.
The same happens in reverse sequence when the HDD starts.
Wrong again.
Check this other one:
http://www.samsung.com/Products/Hard... ecifications
specially the part about START / STOP cycles, and the design life of
this particular HDD, which by the way, is in current production. Now
explain why the manufacturer provides a definite number of START /
STOPS cycles, if those cycles doesnīt cause any kind of damage to the
drive
Thatīs why start / stop cicles have a definite impact in any HDD.
Wrong again. Its actually the spinup thats the problem life wise.
Really? Please explain that in a credible way. Also, explain how the
heads retract in such a way that they never touches the platters as the
HDD stops.. Answers like "I designed HDDīs before they were marketed"
or "I know that because Iīm the master engineer of blah, blah, blah"
arenīt valid ones. Demonstrate what you say.
Have you ever wondered why a HDD last less in
a home environment than in a office environment?
They dont necessarily.
Check this out http://phorums.com.au/archive/index.php/t-42666.html
No thanks, its just plain wrong on that line about heads landing on the platters now.
If you checked that link, you would have found that it talks about YOU,
not HDDīs.
It might teach you a thing or two.
Not even possible for you. You're clearly certain you know it all when you clearly dont.
Isnt it time you ran up the white flag ?
Nope, because Iīm not in a war. You are the one who wants to feel like
an old WW2 hero.