>Quantum IDE drive in a P133 box and hdparm told me that I was
>getting ~3.5MB/s out of that drive. I then moved the same drive
>to a 486 box (which is where it's supposed to reside in the
>future), and on that box hdparm lists only a meagre 1.3MB/s,
Am guessing that the 486 is using a slower transfer rate.
Probably one of the PIO modes instead of a DMA transfer. Or just
a slower PIO mode.
This's a link to PCGuide on PIO & DMA (next page):
http://pcguide.com/ref/hdd/if/ide/modesPIO-c.html.
The transfer rates mentioned are maximum burst rates not
sustained transfer rates.
>matter what I try. That box is a Vesa Local Bus machine (and the
>IDE controller is indeed running off VLB), with which I have no
>experience,
Well that makes it a PIO mode on the 486. DMA needs MCA/PCI.
Check the bios settings for the drives. Thread carefully in
there.
Martin.
--
"If it looks like a duck, and quacks like a duck, we have at least to
consider the possibility that we have a small aquaitc bird of the family
anatidae on our hands". <?>
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