From owner-freebsd-scsi Wed Jan 26 16:37:31 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from mailf.telia.com (mailf.telia.com [194.22.194.25]) by hub.freebsd.org (Postfix) with ESMTP id 1024A154E4 for ; Wed, 26 Jan 2000 16:37:23 -0800 (PST) (envelope-from girgen@partitur.se) Received: from d1o90.telia.com (d1o90.telia.com [195.67.216.241]) by mailf.telia.com (8.9.3/8.9.3) with ESMTP id BAA01715; Thu, 27 Jan 2000 01:36:52 +0100 (CET) Received: from stordatan.telia.com (t3o90p87.telia.com [195.67.217.87]) by d1o90.telia.com (8.8.8/8.8.8) with ESMTP id BAA08259; Thu, 27 Jan 2000 01:36:51 +0100 (CET) Received: from partitur.se (localhost [127.0.0.1]) by stordatan.telia.com (8.9.3/8.9.1) with ESMTP id BAA01505; Thu, 27 Jan 2000 01:36:29 +0100 (CET) (envelope-from girgen@partitur.se) Message-ID: <388F930D.33757719@partitur.se> Date: Thu, 27 Jan 2000 01:36:29 +0100 From: Palle Girgensohn Organization: Partitur X-Mailer: Mozilla 4.7 [en] (X11; U; Linux 2.0.36 i386) X-Accept-Language: sv, en MIME-Version: 1.0 To: mjacob@feral.com Cc: Greg Lehey , "Louis A. Mamakos" , freebsd-scsi@FreeBSD.ORG Subject: Re: cannot mt retension (seagate python) References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Matthew Jacob wrote: > > > On Wednesday, 26 January 2000 at 14:33:37 -0800, Matt Jacob wrote: > > >>> Hmm... my tapes sometimes jam. I though a retension would help, but > > >>> I guess I have to calculate on a certain amount of failure. > > >> > > >> No, this is a problem with your drive. This shouldn't happen, and > > >> it's a bad sign. > > > > > > This happens with some frequency with DAT. Regular head cleaning > > > helps, > > > > That depends on what's causing the jamming. I've never seen any > > relationship between jamming and head cleaning. > > If enough gunk builds up on the heads, the tape lifts off slightly and starts > a roll which can get reverse wrapped around a capstan roller. Actually, what has happened is that the end of the tape has twisted 90 deg. and lies "on top of the casserole" close to the tape rotation axis. (Hey, my English isn't native, please *try* to understand ;-) It is more likely that it has been rewinded too fast than that it has gotten stuck in the capstan or around the tape heads. /Palle To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message