From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: tuhs-bounces@minnie.tuhs.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 0c3fbce9 for ; Tue, 16 Oct 2018 17:14:35 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 226DBA1E4E; Wed, 17 Oct 2018 03:14:34 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id CFDA29E758; Wed, 17 Oct 2018 03:14:00 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 061649E758; Wed, 17 Oct 2018 02:58:06 +1000 (AEST) Received: from mail-lf1-f66.google.com (mail-lf1-f66.google.com [209.85.167.66]) by minnie.tuhs.org (Postfix) with ESMTPS id 5B93E9E708; Wed, 17 Oct 2018 02:58:00 +1000 (AEST) Received: by mail-lf1-f66.google.com with SMTP id n14-v6so5675999lfe.6; Tue, 16 Oct 2018 09:58:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=Z/dekBPtFewrw+Ds25QfdETqhGL0GjsRofyw6qRHlzc=; b=Hz8kMvg8lIEebDLuqN9CuJ16h0uCBVuKygf8AlapWqTl5eb8Oq3GL0V/tR1g9+ws2R SkYHbg5PuscfoB2taHxnH3hZ23siRaeI3sJo/xm+fP20utljNc7flSSOX8JzeZNjcb4l lxpJnnISoJJThpQ2dU6jLjRmsWDN8iGz7t79y8amdfc6crKso321Ik7L+OCaHDhnwwKf jtxAwbx8F2SKjKocZpvtcBzzqjw3IrFxZCBChUFqmjCL8kBK1e+IhQYtdftvpVocokRW NvH3IfNJtP2iqyOeRypwpO40HwOwuSWjtMYBF/yiBDV49IkiSW2w9QZkFOroGoe1g2UI Iq0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=Z/dekBPtFewrw+Ds25QfdETqhGL0GjsRofyw6qRHlzc=; b=h0aSO/CGvLLjjA13snwFzxOe8BslMhI0HvUynloT2aXy+wHddlcw8PA4xXLh4XamNN iAG4GCl62nOXM8fYXkqxCPLMmO1T0j4rS6HJaDHuyy1pniKNArU6aCig3cFwBsHDKAqE kyYdn9rKF2ku/bWAx0h+fn9HwFIWxU1tMTqmKT2JF8sOYlL2uEwI1tspNWkxn5QyMho/ kkhgq2ADRtZp+DVSx3WkRqFmmGqVbxpWQD5uGK3nwuMb0qOge2SgRGIicsd/iIhE3vpC 9Bul0qDKTNHnbrg5YJn0ei+cBQn+woYDyaU1QdfeJoQq4DBI8/xAu/Uo61R9DnvDVKZh OWqQ== X-Gm-Message-State: ABuFfojK1kSVyDZN8VISrLL4r2+PLtAm5KIpLqhhoDBbRucpAJ68l4qH KX9iFYLtDp7TMcO3xikZtkJF1j19yVd2vjZPl3o= X-Google-Smtp-Source: ACcGV60g62NJPTuSe5tMcpJtKjCpxYxvv3ioAXn7rrFvpcYutpmajv4NAR7fwx922NShoLQ1mHMfH4H6JAWRMRnvERI= X-Received: by 2002:a19:cc97:: with SMTP id c145-v6mr13051697lfg.145.1539709078582; Tue, 16 Oct 2018 09:57:58 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a2e:5111:0:0:0:0:0 with HTTP; Tue, 16 Oct 2018 09:57:58 -0700 (PDT) In-Reply-To: References: <20181015195622.GB25749@minnie.tuhs.org> From: Paul Winalski Date: Tue, 16 Oct 2018 12:57:58 -0400 Message-ID: To: Clem Cole Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [TUHS] Ultrix Tape: Block Size? X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: The Eunuchs Hysterical Society , cctalk@classiccmp.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On 10/15/18, Clem Cole wrote: > #$%^ - they >>weren't<< like DECtape from a reliability standpoint ... > =E1=90=A7 The original DECtape was extremely reliable. Not so the TK50. Calling it "DECtape II" was an insult to the original DECtape. The problem wasn't so much the drive itself, but the controller. In an effort to reduce costs, DEC used a controller that had insufficient buffering capability for a streaming, block-replacement tape device such as the TK50. TK50s were prone to both data-late and overrun errors. The block size is almost certainly 512 bytes. -Paul W.