Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
"Ben Pope" <spam@hotmail.com> wrote in message
news:c6m69o$dp5rn$1@ID-191149.news.uni-berlin.de...
> LooseNut wrote:
> > I thought SATA Drives were faster?
>
> Why? OK so SATA has a theoretical peak transfer speed of 150MB/s, but
then
> your PCI bus can't do that, and most drives can;t get more than a few
> microseconds of data across at peak speeds anyway. P-ATA is up to 133MB/s
>
> What limits the speed of a drive is the rotational latency, and track seek
> times. I have never come across a drive that is limited by the interface
it
> uses, it is ALWAYS limited by the mechanics.
>
> > I sure hope they are on my A7N8X-E. Been waiting a long time to get a
> > pair...
>
>
> If you were to get, for example, a WD2500JD and a WD2500JB, they would
> perform about the same, since they are the same drive. The difference is
> the interface. In the JD there is actually a PATA to SATA bridge chip -
> somewhere for additional latency and throughput to be reduced. However,
> this pales into insignificance when compared to the latency and data
> transfer speeds from the platter to the drive controller.
>
> My WD360GD (Raptor) is damn fast, but thats 'cos it's a 10K RPM drive. My
> WD2500JD is pretty good in terms of sustained read rates - comparable to
the
> Raptor, in fact. It can't touch it on writing or seeking though, the
Raptor
> is in a different league (hence the price).
>
> Benchmark Results (WD360GD / WD2500JD) using HDTach 2.70:
> Seek: 8.8 / 13.8ms
> Peak Transfer (useless measure): 99.7 / 75.4 MB/s
> Max Transfer: 60.2 / 60.4
> Average Transfer: 50.5 / 50.6
> Min Transfer: 36.2 / 34.6
>
> So as you can see, pretty much the same for read speeds.
>
> However, the write speeds for the WD2500JD are almost exactly half the
read
> speeds. For the Raptor, they're about the same as the read speeds, as far
> as I can tell (it's my OS drive, so couldn't test writing as it had to be
> unpartitioned)
>
> And in terms of dealing with lots of seeking (accessing directories with
> thousands of files, deleting directories with hundreds of files, and just
> general usage) the Raptor wipes the floor with the WD2500JD.
>
> Ben
> --
And is not the 72Gb Raptor meant to be an improvement on the 36Gb one - not
just double the capacity.
--
Doug Ramage