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Date: Tue, 4 Mar 1997 14:03:01 GMT
From: Neil <long@njl.materials.ox.ac.uk>
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Subject: kern/2873: Tahiti MO disk and od driver
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>Number:         2873
>Category:       kern
>Synopsis:       the od0 devies does not handle a Maxoptix Tahiti II drive
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Mar  4 06:10:02 PST 1997
>Last-Modified:
>Originator:     Neil Long
>Organization:
University of Oxford
>Release:        FreeBSD 2.2-GAMMA i386
>Environment:

	Adaptec AH1542 scsi controller and a Tahiti II MO drive

>Description:

	The Tahiti is recognised on boot as 
 /kernel: (aha0:5:0): "MaxOptix Tahiti 2 A7.4" type 7 removable SCSI 1
/kernel: od0(aha0:5:0): Optical 441MB (904995 512 byte sectors)

attempts to read/set a disklabel generate errors
fdisk od0 logs in messages:-

od0: invalid primary partition table: no magic
disklabel -r -w od0 auto gives
/kernel: od0(aha0:5:0): MEDIUM ERROR info:2 asc:11,0 Unrecovered read error
Mar  4 13:14:11 njl /kernel: od0(aha0:5:0): MEDIUM ERROR asc:13,0 Address mark not found for data field

repeated many times
followed by

Mar  4 13:14:13 njl /kernel: , FAILURE
Mar  4 13:14:13 njl /kernel: od0: error reading primary partition table reading fsbn 0 (od0 bn 0; cn 0 tn 0 sn 0)

The disk is fine when used on a DOS PC (Corel SCSI drivers) or an SGI using 
SG's fx and mkfs (uses scsi info not disktab)
>How-To-Repeat:

	same if disk is re-formated elsewhere, not possible to repeat without
access to hardware.

>Fix:
	
	Is it possible to force it to be handled as in the Zip drive / Jazz?

>Audit-Trail:
>Unformatted: