From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263408AbTDYQvy (ORCPT ); Fri, 25 Apr 2003 12:51:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263413AbTDYQvy (ORCPT ); Fri, 25 Apr 2003 12:51:54 -0400 Received: from chaos.analogic.com ([204.178.40.224]:2699 "EHLO chaos.analogic.com") by vger.kernel.org with ESMTP id S263408AbTDYQvx (ORCPT ); Fri, 25 Apr 2003 12:51:53 -0400 Date: Fri, 25 Apr 2003 13:06:18 -0400 (EDT) From: "Richard B. Johnson" X-X-Sender: root@chaos Reply-To: root@chaos.analogic.com To: John Bradford cc: Matthew Sell , Stewart Smith , Linux Kernel Mailing List Subject: Re: versioned filesystems in linux (was Re: kernel support for In-Reply-To: <200304251618.h3PGINWP001520@81-2-122-30.bradfords.org.uk> Message-ID: References: <200304251618.h3PGINWP001520@81-2-122-30.bradfords.org.uk> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 25 Apr 2003, John Bradford wrote: > > You just modify your user-mode tools and your 'C' runtime library > > to make whatever atrocious versioning mechanism you want. You can > > even make all filenames upper case, just like VAX/VMS, and you can > > even make your shell DCL if you want. It's where the rules are > > enforced like (mapping everything to upper-case). > > > > I can see it now, upon startup `init` execs: > > > > SYS$SYSTEM:LOGINOUT.EXE - > > INPUT=SYS$SYSTEM:[etc]inittab - > > OUTPUT=SYS$SYSTEM:[var.log]startup.log - > > ERROR=SYS$SYSTEM:[dev]console - > > UIC=[0,0] - > > PRIV=(NOALL, TMPMBX, NETMBX, SETPRV) > > Just wondering how difficult it would be to make a 9-track tape drive > from scratch, and connect it up to the parallel port... Do you think > that old hard disk motors, from 5.25" MFM disks be powerful enough for > the 120IPS tape transport? > > John. The disk-drive motors, even for the 5.25 floppies were pancake motors designed to directly turn the floppy, or run a belt with a small ratio. You need a motor that runs at relatively high speed to turn the capstan. If the capstan was 1 inch in circumference (about 0.2'' in diameter), you need 120 revs/sec = 7200 r.p.m. You won't do this with a floppy motor. Cheers, Dick Johnson Penguin : Linux version 2.4.20 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.