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