Date: Sat, 7 Jun 1997 15:05:37 -0400 (EDT) From: tom@tomqnx.com (Tom Torrance at home) To: joerg_wunsch@uriah.heep.sax.de Cc: scsi@freebsd.org, tom@tomqnx.com Subject: Re: CD-R & SCSI Problems Message-ID: <m0waQnx-000A2UC@TomQNX.tomqnx.com> In-Reply-To: <19970607103646.LS18353@uriah.heep.sax.de> from J Wunsch at "Jun 7, 97 10:36:46 am"
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> (Moved to the scsi list, that's what it is for.) > > As Tom Torrance at home wrote: > > > You are absolutely correct. ANother unfounded assumption bites the > > dust. I have absolutely no idea what is causing this, it seems to > > happen every time the tape is either opened or closed - and 'seems' > > to cause no harm. > > Turn on SCSIDEBUG, and see which command is causing it. It might be a > LOAD UNLOAD MEDIUM, or PREVENT ALLOW MEDIUM REMOVAL. Tried that. No additional information was output. > > THe tape drive is an HP Colorado T4000 running off my ahc AHA-2740A. Actually reports at boot as: "HP T4000s 1.07" type 1 removeable SCSI 2 This is the latest and greatest 4-8 GB Travan drive. > It wouldn't surprise me if the SCSI implementation of these drives > weren't the brightest. We've recently seen similar (worse, i think) > examples for a cheap Conner tape. The behaviour of this drive made me > shout that it's apparently a drive that has a 50-pin connector looking > like SCSI, but it isn't really SCSI. (It violated the specs all over > the place, they didn't even bother to implement some mandatory > commands.) Before the problems started, (while I was doing 'make world'), I decided to backup my Windows 95 machine, so I plugged it into that one, and did a backup with the supplied software. Naturally, I used compressed mode. The drive was never powered off since then as it has no on/off switch. The following is the output of an 'mt status' now: /kernel: st0(ahc0:6:0): ILLEGAL REQUEST asc:20,0 Invalid command operation code Present Mode: Density = 0x45 Blocksize = 512 bytes ---------available modes--------- Mode 0: Density = 0x00 Blocksize variable Mode 1: Density = X3.136-1986 Blocksize = 512 bytes Mode 2: Density = X3.39-1986 Blocksize variable Mode 3: Density = X3.54-1986 Blocksize variable Is there any possibility that the density table listed in scsiconf.h is seriously out of date? > > -- > cheers, J"org > > joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE > Never trust an operating system you don't have sources for. ;-) > Regards, Tom
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