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HDTach graph display - Why does it waver so much with RAID, but is steady with single drive?

MichaelD

Lifer
I'm just curious, so I thought I'd ask. I use HDTach (version 2.60, I think) and I check my HD's with it.

I have 2 40GB Maxtor DM60+ drives in a RAID 0 config on the mobo controller (Abit KT7R)

I have a single 45GB Maxtor DM60+ as Secondary IDE slave.

HdTach shows that my RAID array is an average of 25% faster in sustained data transfer than the single drive. (43mb/s vs. 33mb/s) That's cool.

But curiously enough, the line that goes across the chart showing read speeds at different drive positions (what is drive position anyway?) is nice and smooth across the chart for the single drive, but goes way up and down (about a 10mb raise/drop) for the RAID array.

Everything is functioning as it should; no performance issues. (RAID rocks!) but I'm curious as to the technichal reason why the chart wavers.

Thanks for your time. NelsonMuntz, RU out there? 🙂
 
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