Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site umcp-cs.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!umcp-cs!chris From: chris@umcp-cs.UUCP (Chris Torek) Newsgroups: net.unix-wizards Subject: Re: 4.1 BSD mkfs(8) for an RA81? Message-ID: <2095@umcp-cs.UUCP> Date: Mon, 4-Nov-85 21:24:48 EST Article-I.D.: umcp-cs.2095 Posted: Mon Nov 4 21:24:48 1985 Date-Received: Tue, 5-Nov-85 07:47:23 EST References: <2787@brl-tgr.ARPA> Organization: U of Maryland, Computer Science Dept., College Park, MD Lines: 21 > ... for comparitive purposes, here's what disk parameters are > for various kinds of disks, as seen by TOPS-20: > > Disk RECSIZ TRKSIZ CYLSIZ DSKSIZ > [...] > RA81 512 161 1 128 > [...] > RECSIZ := number of 36-bit words/record > TRKSIZ := number of records in a track > CYLSIZ := number of tracks/cylinder (number of surfaces) > DSKSIZ := number of cylinders That is interesting---and wrong. There are 14 tracks per cylinder. In normal terms (I have no idea how you stuff 512 36 bit words into a 512 byte sector) RA81s have 512 bytes per sector, 51 sectors per track, 14 tracks per cylinder, and 1248 cylinders, for a total of 891072 blocks or 456,228,864 bytes (~450Mb). -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251) UUCP: seismo!umcp-cs!chris CSNet: chris@umcp-cs ARPA: chris@mimsy.umd.edu