On Fri, Feb 04, 2005 at 07:21:59PM -0500, Gene Heskett wrote:
> Aha, LVD! LVD is not compatible with the rest of the system unless
> the rest of the system is also LVD. It is two, completely seperate
> signalling methods that just happen to use the same cabling.
Yes and no. From the SCSI FAQ: "[ANSI] specified that if an LVD
device is designed properly, it can switch to S.E. [single-ended,
i.e. "normal", SCSI] mode and operate with S.E. devices on the
same bus segment."
- http://h000625f788f5.ne.client2.attbi.com/scsi_faq/scsifaq.html#Generic099
So if you mix it with S.E., you lose its LVDness, e.g. you have
to stick to a S.E. bus length; but you shouldn't fry any
hardware.
HVD (high-voltage differential, i.e. the original differential
variant of SCSI) is another story completely! That is indeed
flat-out incompatible with S.E. (and presumably with LVD too...)
--
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|-_|/ > Eric Siegerman, Toronto, Ont. erics AT telepres DOT com
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The animal that coils in a circle is the serpent; that's why so
many cults and myths of the serpent exist, because it's hard to
represent the return of the sun by the coiling of a hippopotamus.
- Umberto Eco, "Foucault's Pendulum"
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