...very nice brakedown...
----- Original Message -----
From: "James Button" <[EMAIL PROTECTED]>
> If just copying a partition, then you can pretty much ignore ATA if you
are
> above 66 -
Did you mean ATA-66 or higher?
> Next consideration -
> How many drives are (trying to ) using the interface cable at the same
time
> lose 25% if two drives are actively using the cable at the same time
> They need to negociate which can use it, and then get confirmation that
it's
> them
This point is often missed - it'a parallel, but one at a time, plus some
negotiations.
> Now - are they using DMA or PIO
> PIO uses the CPU to move data from the drive controller to memory
> DMA doesn't
This can still be set, when using on-board controller, but most PCI
controllers (Promise) do it automatically. There's no option in the Promise
driver for DMA.
Now that we're talking controllers and speed... one thing I still have not
tracked down is the effect of one drive on another, when on the same
controller cable.
In the older controllers (33 and older) the controller defaulted to the
slower of the two drives, but at least with PCI controllers ATA-66 and on,
the two drives are more independant.
Do not know if this also true for on-board ATA-66 controllers? Are the two
drives independant, or is the CD or DVD drive dragging down the HD?
Rich
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