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From: garyb@SSD.CSD.HARRIS.COM (Gary Barton)
Newsgroups: comp.periphs.scsi,comp.unix.sysv386
Subject: Re: SCSI error -- medium changed in drive
Keywords: SCSI reset error media changed
Message-ID: <1604@travis.csd.harris.com>
Date: 27 Nov 90 17:27:44 GMT
References: <66.UUL1.3#1@vortex.COM>
Sender: news@travis.csd.harris.com
Followup-To: comp.periphs.scsi
Organization: Harris Computers Systems Division, Fort Lauderdale,FL
Lines: 31

In article <66.UUL1.3#1@vortex.COM> lauren@vortex.COM (Lauren Weinstein) writes:

>*** DEVICE ERROR: Medium has been changed in drive ***

Most CCS disk drives use the same additional sense code to indicate a
device was reset or the media may have changed.  I suspect that
something caused the SCSI bus to be reset, which then generates a
check condition with this error code on the next access.  SCSI device
drivers generally expect to see this condition after they have forced
a device or bus reset, but if it occurs outside of their control, they
treat it like any other error.  It could be that device/bus reset was
attempted as part of some error recovery procedure by the disk (or
other) driver.  Device themselves will sometimes cause a bus reset.  I
have seen some disk drives (Fujitsu) with strappings that tell the
imbedded SCSI controller whether or not it should activate the SCSI
bus reset when the drive is powered on.  The SCSI reset line could in
theory be activated by plugging/unplugging a device from an operating
SCSI bus, or perhaps there could be some other cabling/termination
problem.

The point is, this is most likely the result of device or bus reset,
not a media changed condition.

--
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| Gary Barton                    | System Software Development      |
| Lead Engineer			 | Harris Computer Systems Division |
| garyb@hcx1.csd.ssd.harris.com  | 2101 W. Cypress Creek Rd.        |
| gbarton@ssd.harris.com         | Ft. Lauderdale. FL 33309         |
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