From owner-freebsd-scsi@FreeBSD.ORG Sat Nov 6 00:32:57 2004 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5DD4116A4CE for ; Sat, 6 Nov 2004 00:32:57 +0000 (GMT) Received: from rambutan.pingpong.net (81.milagro.bahnhof.net [195.178.168.81]) by mx1.FreeBSD.org (Postfix) with ESMTP id 515E243D45 for ; Sat, 6 Nov 2004 00:32:56 +0000 (GMT) (envelope-from girgen@pingpong.net) Received: from localhost (localhost [127.0.0.1])iA60WsqV091339 for ; Sat, 6 Nov 2004 01:32:54 +0100 (CET) (envelope-from girgen@pingpong.net) Date: Sat, 06 Nov 2004 01:32:54 +0100 From: Palle Girgensohn To: freebsd-scsi@freebsd.org Message-ID: <4501DBD4728A1FD2B7595244@rambutan.pingpong.net> X-Mailer: Mulberry/3.1.6 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Subject: how "reformat" DLT IV tape from 20/40 to 40/80? X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 Nov 2004 00:32:57 -0000 Hi! Just got a new taper, an HP DLT VS80. We previously had an Adic, 20/40. The use the same type of tapes, DLT IV. Now, I want to keep using some of the old tapes, but the HP won't write to them, and I believe that is because they are just 20/40 GB, not 40/80 GB. I found some info saying that the first time a tape is used, the taper writes info about the density (or sets the density somehow). I use FreeBSD, so I expect mt(1) should somehow be able to perform the trick. Some tapers seem to have a button for switching density, but this machine doesn't. Odd thing is, "mt stat" always returns 0x41 density, which is 40 GB. Both for new and old tapes: Mode Density Blocksize bpi Compression Current: 0x41:DLTapeIV(40GB) variable 98250 IDRC ---------available modes--------- 0: 0x41:DLTapeIV(40GB) variable 98250 IDRC 1: 0x41:DLTapeIV(40GB) variable 98250 IDRC 2: 0x41:DLTapeIV(40GB) variable 98250 IDRC 3: 0x41:DLTapeIV(40GB) variable 98250 IDRC --------------------------------- Current Driver State: at rest. --------------------------------- File Number: 0 Record Number: 0 Residual Count 0 Any ideas how to fix this? Thanks! Palle