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_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 71678f01 for ; Wed, 27 Nov 2019 20:56:32 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 54DAE9B7DB; Thu, 28 Nov 2019 06:56:31 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 61B8E93D8C; Thu, 28 Nov 2019 06:56:20 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (1024-bit key; unprotected) header.d=kilonet.net header.i=@kilonet.net header.b="mvB2jYpP"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id 8CEF793D8C; Thu, 28 Nov 2019 06:56:18 +1000 (AEST) Received: from p3plsmtpa06-02.prod.phx3.secureserver.net (p3plsmtpa06-02.prod.phx3.secureserver.net [173.201.192.103]) by minnie.tuhs.org (Postfix) with ESMTPS id 1B25E93D59 for ; Thu, 28 Nov 2019 06:56:18 +1000 (AEST) Received: from medusa.kilonet.net ([72.69.223.115]) by :SMTPAUTH: with ESMTPA id a4MDi0MIGZCRfa4MDirAbj; Wed, 27 Nov 2019 13:56:17 -0700 Received: from [199.89.231.101] (ender.kilonet.net [199.89.231.101]) by medusa.kilonet.net (8.14.8/8.15.1) with ESMTP id xARKuGGA016746 for ; Wed, 27 Nov 2019 15:56:16 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kilonet.net; s=default; t=1574888176; bh=gpe2EL3vOYBFyp47Mtv1mzyMuC0mj2/5N6uNRH1V1Vs=; h=Subject:To:References:From:Date:In-Reply-To; b=mvB2jYpPtkIw1V9iGLl4bTkKG+iWLLQ9Mn8AC5cwTbYtzMcsmRLll+iit6f6+1bG8 YEdWYK2TwE8noJ5DcUvQtAv3Fpxa32qBAARE1MJ5gCglYjtfXKMML3doMDQtfK90+Y aEGTpZbcQUgC9wypu6V/dL5B5grDb81bDDdehhKU= To: tuhs@minnie.tuhs.org References: <20191124225239.GG18200@mcvoy.com> <20191127204311.448C393D8C@minnie.tuhs.org> From: Arthur Krewat Message-ID: Date: Wed, 27 Nov 2019 15:56:10 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: <20191127204311.448C393D8C@minnie.tuhs.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-CMAE-Envelope: MS4wfIN2DOtbXXn9cWzve2cNs9S1V0xSvUYrHl4MI1tWE+cqVyTtu8mRp/QkBJSNmdevLqVPG7NYtc2+lsc5M9d5JKj+KMUSlCbssKnVwWA7Dj+ZC0f21MS8 TksCde2zTgTT054v4j2CWyW8Jr3drX7rfvvelMW2oUHAdBEw46TAEOP3QGw2yFfVqXfL/wZCvdhwSw== 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 11/27/2019 2:31 PM, John Foust wrote: > I couldn't get any of the DDS-2 to read, either on the original hardware that wrote them, or on a newer STD28000N drive I bought on eBay, a pull from an old Apple server. I could write new tapes on the drive, just couldn't read any old ones. My attempts included reading some tapes I know I'd received from other people (that is, written on other drives) that I know I had been able to read on this hardware back in the day. They wouldn't read, either. That sounds like a block size issue. Usually telling dd to use a larger block than the tape has is fine, but if the default is smaller than what's on the tape, it'll fail. Depending on the drive firmware, the OS support for that particular drive, etc, you may or may not get warnings or errors that actually mean anything. A long time ago, I attempted to read some 9-track TOPS-10 tapes using a Sun and a 6250 BPI capable tape drive. Nothing would read, it looked like there were actually no files on the tape whatsoever. So I gave up, but kept the tapes because they contained a lot of personal stuff I had done in high school and a few years after. Years later, I got my hands on a Sun3/280 with 9-track tape drive, and attempted to read them again. Same thing, looked like there were no files on the tape. Started increasing the block size, and VOILA, got data. Very odd circumstance, but block size has a lot to do with trying to read tapes. QIC-150, 8mm, 9-track, I've run into it a lot. art k.