From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 59dadf89 for ; Mon, 25 Nov 2019 17:07:22 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 754FA9C61B; Tue, 26 Nov 2019 03:07:21 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C215793D74; Tue, 26 Nov 2019 03:06:52 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=fail reason="key not found in DNS" (0-bit key; unprotected) header.d=bitsavers.org header.i=aek@bitsavers.org header.b="H8IjTTsl"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 5A61393D74; Tue, 26 Nov 2019 03:06:50 +1000 (AEST) Received: from ezwind.net (smtp.ezwind.net [71.91.242.96]) by minnie.tuhs.org (Postfix) with ESMTPS id B964693D71 for ; Tue, 26 Nov 2019 03:06:49 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/relaxed; d=bitsavers.org; s=MDaemon; t=1574701606; x=1575306406; i=aek@bitsavers.org; q=dns/txt; h=Subject:To:References:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To:Content-Type: Content-Language:Content-Transfer-Encoding; bh=FwDW6+QBOh4Za0F6m APMNVAIxRyFsnfilwf+PADo03I=; b=H8IjTTslLS+iR1kJSAiybHTSwJzWXbxhq qySB8JPy3gIVC73B0uurz2JMvB40a72fnEqKZ4UXbI/6aTEESqZ1r4L/GLERsvBs rBBY1DNuq2GM51sWPlo7/BrH10tpheBPSAtb1YMacxYfVwewKMA8snZhsa23vxY4 ZUT8gZZi4U= X-MDAV-Result: clean X-MDAV-Processed: ezwind.net, Mon, 25 Nov 2019 11:06:46 -0600 Received: from aekmac.local by ezwind.net (MDaemon PRO v16.0.4) with ESMTPA id 50-md50000055883.msg for ; Mon, 25 Nov 2019 11:06:45 -0600 X-MDRemoteIP: 71.6.95.114 X-MDHelo: aekmac.local X-MDArrival-Date: Mon, 25 Nov 2019 11:06:45 -0600 X-Authenticated-Sender: aek@bitsavers.org X-Return-Path: prvs=1232085fbf=aek@bitsavers.org X-Envelope-From: aek@bitsavers.org X-MDaemon-Deliver-To: tuhs@minnie.tuhs.org X-CAV-Result: clean To: tuhs@minnie.tuhs.org References: <20191124225239.GG18200@mcvoy.com> <20191125032404.GM18200@mcvoy.com> From: Al Kossow Message-ID: <0a6fb097-fe79-1633-0205-1c45f0a56953@bitsavers.org> Date: Mon, 25 Nov 2019 09:07:00 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20191125032404.GM18200@mcvoy.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [TUHS] Someone wants to use an exabyte X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On 11/24/19 7:24 PM, Larry McVoy wrote: > So that sounds like a different problem. People correct me if I'm > wrong but the exabyte drives seemed to have a head alignment problem. They are 8mm helical-head drives. they wouldn't go out of alignment by bumping them, the worse would be the tape would lose tension if you smacked the tensioning arms hard enough They do have a lot of rubber parts inside. Rollers crack and belts go soft. I have several dozen dead EX8200s from that. I have a whole box of 8mm backup tapes that just came in, and a small number of working drives. The Linux software I wrote to do 9 track tape recovery from a SCSI 9 track drive works just fine on an Exabyte. And I'm not offering to read Jason's mystery reels.