Re: 3.5 inch drive

Michael Schwingen (
Fri, 8 Nov 1996 16:38:12 +0100 (MET)

> Yup. Another Yessir. Any decent Ultra controller will do. It is the 8 bit
> variant, and so only uses those lines. It is kind of nice, because you get
> the benefit of 20MB/sec data rate (same as wide) without paying the price
> for 68 pin cabling. It also means you can use the same cabling for your

On the other side, it means that you need (expensive) ULTRA-capable cabling,
both internal and external, and you need this whether you attach ULTRA
devices or not, since the signal rise/fall times cause the problems, not the
actual clock on the bus.

Furthermore, you must be even more cautious about termination: active is an
absolute must.

So you get the problems of Ultra SCSI, without real advantages: there are
few drives whose performance can't be used on a 10MHz FAST controller. It
only becomes a difference when you are running multiple fast drives from one
SCSI chain.


Michael Schwingen                       <>
Institut fuer Statistik und Wirtschaftsmathematik, | In the beginning there was
Wuellnerstr. 3, 52056 Aachen                       | nothing, which exploded.

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