From owner-freebsd-scsi@FreeBSD.ORG Wed Nov 24 00:04:59 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 88E3916A4CE for ; Wed, 24 Nov 2004 00:04:59 +0000 (GMT) Received: from melon.pingpong.net (82.milagro.bahnhof.net [195.178.168.82]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3138143D1D for ; Wed, 24 Nov 2004 00:04:59 +0000 (GMT) (envelope-from girgen@pingpong.net) Received: from localhost (localhost [127.0.0.1]) by melon.pingpong.net (Postfix) with ESMTP id 18BA7D2FA; Wed, 24 Nov 2004 01:04:58 +0100 (CET) Received: from melon.pingpong.net ([127.0.0.1]) by localhost (melon.pingpong.net [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 10788-03-3; Wed, 24 Nov 2004 01:04:57 +0100 (CET) Received: from palle.girgensohn.se (1-2-8-5a.asp.sth.bostream.se [82.182.157.66]) by melon.pingpong.net (Postfix) with ESMTP id 9B1BFD2D5; Wed, 24 Nov 2004 01:04:57 +0100 (CET) Date: Wed, 24 Nov 2004 01:04:59 +0100 From: Palle Girgensohn To: jgrosch@MooseRiver.com Message-ID: <7E7AD3CF2D1C871258B43DF4@palle.girgensohn.se> In-Reply-To: <20041123234626.GA6938@mooseriver.com> References: <4501DBD4728A1FD2B7595244@rambutan.pingpong.net> <00423C3D385D81D7DA03D6E6@palle.girgensohn.se> <20041123234626.GA6938@mooseriver.com> 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 X-Virus-Scanned: by amavisd-new at pingpong.net cc: "Bjoern A. Zeeb" cc: freebsd-scsi@freebsd.org Subject: Re: 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: Wed, 24 Nov 2004 00:04:59 -0000 --On tisdag, november 23, 2004 15.46.26 -0800 Josef Grosch wrote: > On Tue, Nov 23, 2004 at 11:15:12PM +0100, Palle Girgensohn wrote: >> Hi! >> >> I tried degaussing a tape, but the degaussed tape is not accepted by the >> taper. The tape is ejected after about 30 s, the Media light flashes, >> manual says: >> >> An inappropriate tape has been >> loaded into the drive. The tape >> should automatically eject. >> >> Do I need to format the tape? I really doubt that, and how would I be >> able to do that anyway if the tape is not accepted by the taper? Was it >> not enough degaussed? Also seems odd, doesn't explain why the taper >> ejects the tape? >> >> Any ideas welcome! >> >> Regards, >> Palle > > Most likely the tape is defective. These tape drives keep track of the > number of defects it finds on a tape. If that number goes above a certain > count, 20 I think, the tape is rejected. Also, the drives tries to read > and/or write a header on the tape. If it can't the tape is rejected. > > Your best bet is to throw that tape away and get another. I used to have a > box full of tapes that my 8mm drive rejected. I thought that I might be > able to get them to work. Repeated degaussing never did the trick. Maybe, but it was not defective before degaussing. According to specs, the DLT's need a pretty strong magnetic flux to be properly degaussed. My best guess is it was not enough degaussed. But perhaps it became defective by the degauss. It just seems so unlikely... Thanks for the input! /Palle