Narrow devices on a wide bus

Brian A Berg bberg at
Wed Apr 10 17:11:51 PDT 1996

* From the SCSI Reflector, posted by:
* Brian A Berg <bberg at>
Re: a mix or narrow and wide devices on a wide SCSI bus, I have successfully
used a wide device in wide mode and a narrow device in narrow mode on
Silicon Graphics computers.  Any implementation of SCSI on a host that does
not allow this is presumably a bug in the host computer's driver.

Ron Arp (and anyone else): in which environment did you see only narrow
use of a wide device when the wide bus also had a narrow device(s) on it?
Of course, any narrow device on such a bus must be further away from the
host on the daisy chain than any wide device(s), as the bus goes from 16
to 8 bits upon reaching the first narrow device.  Could such a cabling
error have caused your problem?
  Brian A. Berg           E-mail: bberg at
  Berg Software Design     Voice: 408.741.5010
  P.O. Box 3488              FAX: 408.741.5234
  Saratoga, CA 95070 USA   Focus: software consulting: SCSI, optical storage

More information about the T10 mailing list