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On 09/30/2010 07:00 PM, Peter Humphrey wrote: |
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> On Thursday 30 September 2010 14:10:42 Florian Philipp wrote: |
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> |
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>> An HDD gets slower when you read the inner tracks. The angular |
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>> velocity is constant (5400 RPM) while the tangential velocity gets |
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>> lower with the radius. |
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> |
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> Are you telling us that the length of a stored bit is constant? I'd have |
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> thought it was the time needed to read or write a bit that was constant; |
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> otherwise the electronics would get extremely complex. In that case it's |
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> the angular velocity that counts, not the linear velocity, and it |
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> matters not which track your data are on. (If a block goes past the head |
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> twice as fast, it also occupies twice the space, so you're back where |
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> you were.) |
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Uhm, no. The higher the linear velocity, the higher the read/write |
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speed. This can be proven with any disk benchmark that can bench the |
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whole disk. You get a graph that begins low and ends high (and the |
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difference between inner and outer region is substantial, almost 2:1). |
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