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[TweakTown] World's first 6TB Helium HDD - Page 7

post #61 of 130
Duckie, I'm a bit confused as to how platter inertia is relevant. So long as the motor can get the platters up to speed and hold them there (the latter is a given if the former is true, yes?).

If you said drag (or possibly fly height), then that might makes more sense to me.
Edited by u3b3rg33k - 3/27/14 at 9:31pm
 
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post #62 of 130
Quote:
Originally Posted by Playapplepie View Post

Isn't the supply of helium dangerously close to being depleted?

Doesn't take much helium to fill a HDD.
Quote:
Originally Posted by Zaid View Post

So how does the helium stay in the hDD? I though all HDD's had to be open to the atmosphere so that pressure can be equalized, thats why all HDD's have that small side hole with a filter on it.

These are pressurized to a specific pressure. No holes.
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post #63 of 130
Quote:
Originally Posted by u3b3rg33k View Post

Duckie, I'm a bit confused as to how platter inertia is relevant. So long as the motor can get the platters up to speed and hold them there (the latter is a given if the former is true, yes?).

If you said drag (or possibly fly height), then that might makes more sense to me.

It's not just spinning up the platters (which takes something like 10-20w on a 3.5" HDD), motor has to be powerful enough to control the platters at a very constant rate. The trend since the beginning of HDDs is to go smaller.
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post #64 of 130
stop pushing HDD capacities, time to intro 10K rpm 3.5 HDD as mainstream.
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post #65 of 130
Quote:
Originally Posted by Clocknut View Post

stop pushing HDD capacities, time to intro 10K rpm 3.5 HDD as mainstream.

For the price, just get a SSD. You will actually have noticeable gains from one.
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post #66 of 130
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post

No.

1) Helium do help to reduce the weight by allowing lighter platters. However, the physics are still the same.... larger platters means increased interia which means more powerful motors.
2) Do you know how long a 4x10TB RAID or ZFS rebuild would take? Days.... maybe even a week if the system is in use. If you have additional failures during the rebuild.... trouble. Plus there are performance degradation during this time.
3) How would helium help physically change the fact that angular velocity increases on the outer edge of a platter?

The platters arent larger, they are the actually thinner for petes sake. less wind resistance=less drag=more platters. very simple. Same size, yet thinner.
they arent trying to change the angular velocity, that is a non-issue.
post #67 of 130
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post

For the price, just get a SSD. You will actually have noticeable gains from one.

Point me to this affordable 6TB SSD!
post #68 of 130
Any guesses how much the 6tb he hdds will cost?
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post #69 of 130
Quote:
Originally Posted by FastMHz View Post

Actually, I don't see why they couldn't use hydrogen in HDDs. It's cheaper and lighter than helium, and the amounts that would be used are so small - charging a dead lead-acid battery may produce more. PLUS, you need OXYGEN mixed with hydrogen to make it explosive. If it's pure hydrogen sealed inside a HDD, it can't blow up. Simple physics.

But people are afraid of hydrogen.
The reason you can't use Hydrogen is that it will cause the metal to become brittle over time. you can reduce the effects by using better alloys but they are much more expensive. This is one of the problems when it comes to hydrogen storage.

http://en.wikipedia.org/wiki/Hydrogen_embrittlement
Quote:
Originally Posted by Computurd View Post

Point me to this affordable 6TB SSD!

You do not need an SSD for media, an HDD is more than enough. That is why most on here use both.
Edited by mam72 - 3/28/14 at 1:23am
post #70 of 130
Quote:
Originally Posted by Computurd View Post

Point me to this affordable 6TB SSD!

What a specialist taking Duckie's posts out of context you are.

He was mentioning 3.5" 10K RPM drives are absolutely demolished by SSDs price/performance/capacity wise. Nothing to do with a 6TB SSD.
   
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