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#1
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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
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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
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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
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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
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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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