Newsgroups: comp.sys.next, comp.periphs.scsi
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!van-bc!jchin
From: jchin@wimsey.bc.ca (Joseph Chin)
Subject: SCSI question
Organization: Wimsey Associates
Date: Tue, 23 Apr 1991 06:31:00 GMT
Message-ID: <1991Apr23.063100.29089@wimsey.bc.ca>

My recent problems with hooking SCSI devices to my 040 cube and the lack
of solution (tho lots of helpful souls at NeXT and HSD have torn all
their hair out on my behalf) have forced me to venture into the wonderful
world of SCSI and try to find an end to this hell!

I need help understanding the intricacies of SCSI and how it works. If
you're a SCSI expert (or even better, a real life SCSI engineer) and you
can spare the time, I will be super grateful if you can clarify the following
for me:

Q. Can an application program accessing a SCSI device through /dev/sg, for
example, a SCSI scanner software, "drop the line" on the SCSI bus before
a transfer (say ... from scanner to HD, or in general, just reading from
the HD) is completed thus causing the following error to appear on the
Console:
	"sd0: Incomplete disk transfer; bytes moved=0x2000; resid= ..."

This may be a stupid and unfounded question, but my limited knowledge
has led me to believe this may be a possible source for my (and possibly
many others) SCSI problems.

Thanks.

:-( Joe
jchin@van-bc.wimsey.bc.ca

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