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Hard Drive RPM... Why? - Page 2

post #11 of 28
My father used to help design the software and controller boards for Hard disks. Ill ask him sometime about this and se what he says about it.
    
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post #12 of 28
Thread Starter 
Got somewhat of an answer...

http://www.storagereview.com/guide20...spinSpeed.html
At one time all PC hard disks spun at 3,600 RPM; in fact, for the first 10 years of the PC's existence, that was all there was. One reason for this is that their designs were based on the old designs of large, pre-PC hard disks that used AC motors, and standard North American AC power is 60 cycles per second (60 Hz): 3,600 RPM.


I seems like most are based off the 3600RPM.
3600
42001/6
45001/4
52009/13
54001/2
72001
100001 2/3
120002 1/3
150003 1/6
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post #13 of 28
Quote:
Originally Posted by DuckieHo View Post
Got somewhat of an answer...

www.storagereview.com/guide2000/ref/hdd/op/spinSpeed.html
At one time all PC hard disks spun at 3,600 RPM; in fact, for the first 10 years of the PC's existence, that was all there was. One reason for this is that their designs were based on the old designs of large, pre-PC hard disks that used AC motors, and standard North American AC power is 60 cycles per second (60 Hz): 3,600 RPM.

You linked to same exact article he did before.... just a different site......
    
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post #14 of 28
Quote:
Originally Posted by bdattilo View Post
Don't know why they chose those values for speed, but I do know that there is some 10800 RPM drives out there. My guess is that those values were chosen because that is the fastest that they could get the drive. For example, when they came out with the 5400 RPM drives, that was top of the line. So instead of spending money to make it 5600 RPM, they dumped money into research for something even faster, and go 7200 RPM, a new limit.....and then on up to 15000. Just my guess though.

10800 yes..... 5400 x 2 = 10800

7200 x 2 = 14400. Pop on a little bit, and it's 15'000

You will often see hard drives advertised as being capable of a certain RPM (Revolutions Per Minute), this figure (as the name suggests) refers to how many times the spindle makes a complete 360º turn in any single minute.

The higher the RPM, the faster the data can be read from the platters, which increases overall performance.

RPM values range from about 5,400RPM to 12,000RPM and above

Quite simple really.


Businesses need FAST data transfer....servers and such. So they make HIGH rpm drives. Sure enough....PC enthuisasts, and gamers want these too...so now they're common things
    
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post #15 of 28
Also you have to think of material technology, spinning something at 7200 24/7 is a lot of stress on components, so I think as the materials and technological advances come, they higher the RPM's will go
    
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post #16 of 28
Thread Starter 
Quote:
Originally Posted by atomicfission92 View Post
Also you have to think of material technology, spinning something at 7200 24/7 is a lot of stress on components, so I think as the materials and technological advances come, they higher the RPM's will go
http://www.pbs.org/cringely/pulpit/2...26_001143.html
Current technology uses glass or aluminum for HD platters. Steel or titanium would allow stronger and thinner plates to allow more platters spinning at faster speeds.


The question I am asking is NOT if higher RPMs help. It is NOT why they make them faster. It is NOT how they make them faster. I am curious on why do they use those specific sets of RPM values across manufacturers.
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post #17 of 28
And you need also to think of were the disks are gonna be used.
If you put a 15K HD in a everiday pc, it would need cooling , that would be expensive and teh gains wouldn't be much.
You don't need 15K when opening a word doc, you need them when you're opening the last scene from a HD movie you made.....
It also got to due with were it's gonna be used and if they need lots of speed or the reg speed is sufficient.
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post #19 of 28
Thread Starter 
Quote:
Originally Posted by Du@lGeEk View Post
And you need also to think of were the disks are gonna be used.
If you put a 15K HD in a everiday pc, it would need cooling , that would be expensive and teh gains wouldn't be much.
You don't need 15K when opening a word doc, you need them when you're opening the last scene from a HD movie you made.....
It also got to due with were it's gonna be used and if they need lots of speed or the reg speed is sufficient.
A few people do run SCSIs in their home PCs fine. 7200RPMs was considered fast 10 years ago but is everyday now. Missing my quesition on WHY is it exactly 15K and not something like 15.1K RPMs.


Quote:
Originally Posted by Distraught_Youth View Post
Still nothing... Thanks for the input thus far but that's NOT the question I am asking. Why are those particular values used? Yes, faster is better... why don't we see 7300RPM drives as opposed to our 7200RPM drives? When WD released the new 150GB Raptor, it remained at 10K RPM. It has been 3 years since the original Raptor... so why don't we see a 11K RPM Raptor?

I know the original HDs at 3600RPM was due to US AC electricity (60Hz for 60s). How about all the HDs that have since came after and run on DC?
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post #20 of 28
What if it is, as you said, purely a mathematic relation to 3600 RPM...
It is just random proportions that they have chosen...
I mean, why are CD 12cm wide ? (Don't start a new thread asking about this )
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