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disk bandwith decreasing?



 
 
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  #1  
Old June 7th 04, 11:05 AM
Stephane Guyetant
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Default disk bandwith decreasing?

I read in a recent PhD dissertation: "Due to the higher complexity of
micro-actuation and track-tracing required during track and head
switches, increased disk storage density actually decreases the disk
bandwith."

Wow! My reference figure for that matter was that disk bandwith keeps
increasing at a 40% rate per year. But I've just checked last barracuda
drive: it has a sustained bandwidth of 58MB/s, not much more than last
year, huh?

Anyway I don't understand the argument about the complexity...
  #2  
Old June 7th 04, 06:14 PM
Paul Rubin
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Default

Stephane Guyetant writes:
Anyway I don't understand the argument about the complexity...


I think the idea is that track density gets higher, you need more
complicated precision actuators to position the head on the track.
That means that track to track seek time increases. During seeks, no
data is getting transferred, so if you spend more time seeking,
bandwidth is lower.
  #3  
Old June 9th 04, 05:24 AM
VirtualSean
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Default

Stephane,

I am interested in reading the referenced paper, however, a Google search
produced this:

www.ece.northwestern.edu/~schiu/sd/OE.pdf

dead link.

Can you perhaps supply an active link to this paper?


Thanks.

--
VirtualSean

Stephane Guyetant wrote in message ...
I read in a recent PhD dissertation: "Due to the higher complexity of
micro-actuation and track-tracing required during track and head
switches, increased disk storage density actually decreases the disk
bandwith."

Wow! My reference figure for that matter was that disk bandwith keeps
increasing at a 40% rate per year. But I've just checked last barracuda
drive: it has a sustained bandwidth of 58MB/s, not much more than last
year, huh?

Anyway I don't understand the argument about the complexity...

  #4  
Old June 9th 04, 08:39 AM
Stephane Guyetant
external usenet poster
 
Posts: n/a
Default

VirtualSean wrote:
Stephane,

I am interested in reading the referenced paper, however, a Google search
produced this:

www.ece.northwestern.edu/~schiu/sd/OE.pdf

dead link.

Can you perhaps supply an active link to this paper?


sure!

http://www.ece.northwestern.edu/~schiu/sd/nuphd.pdf

see p.14 for the quote.


Thanks.

--
VirtualSean

Stephane Guyetant wrote in message ...

I read in a recent PhD dissertation: "Due to the higher complexity of
micro-actuation and track-tracing required during track and head
switches, increased disk storage density actually decreases the disk
bandwith."

Wow! My reference figure for that matter was that disk bandwith keeps
increasing at a 40% rate per year. But I've just checked last barracuda
drive: it has a sustained bandwidth of 58MB/s, not much more than last
year, huh?

Anyway I don't understand the argument about the complexity...

  #5  
Old June 9th 04, 07:19 PM
VirtualSean
external usenet poster
 
Posts: n/a
Default

Stephane,

Got it - thank you!


--
VirtualSean


Stephane Guyetant wrote in message ...
VirtualSean wrote:
Stephane,

I am interested in reading the referenced paper, however, a Google search
produced this:

www.ece.northwestern.edu/~schiu/sd/OE.pdf

dead link.

Can you perhaps supply an active link to this paper?


sure!

http://www.ece.northwestern.edu/~schiu/sd/nuphd.pdf

see p.14 for the quote.


Thanks.

--
VirtualSean

Stephane Guyetant wrote in message ...

I read in a recent PhD dissertation: "Due to the higher complexity of
micro-actuation and track-tracing required during track and head
switches, increased disk storage density actually decreases the disk
bandwith."

Wow! My reference figure for that matter was that disk bandwith keeps
increasing at a 40% rate per year. But I've just checked last barracuda
drive: it has a sustained bandwidth of 58MB/s, not much more than last
year, huh?

Anyway I don't understand the argument about the complexity...

 




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