From mboxrd@z Thu Jan 1 00:00:00 1970 From: wkt@tuhs.org (Warren Toomey) Date: Tue, 24 Apr 2018 10:27:46 +1000 Subject: [TUHS] i-nodes in middle of disk In-Reply-To: <20180424002517.GA21197@minnie.tuhs.org> References: <9a5e49bb-f235-4b87-445b-1532d8facd2f@update.uu.se> <20180424002517.GA21197@minnie.tuhs.org> Message-ID: <20180424002746.GA23743@minnie.tuhs.org> On Tue, Apr 24, 2018 at 10:25:17AM +1000, Warren Toomey wrote: >On Tue, Apr 24, 2018 at 01:44:06AM +0200, Johnny Billquist wrote: >>Which is also why the file system for RSX (ODS-1) placed the index >>file (equivalent of the inode table) at the middle of the disk by >>default. >> >>Not sure if Unix did that optimization, but I would hope so. (Never >>dug into that part of the code.) > >Boston Children's Museum RK05 driver for 6th Ed springs to mind! See the blurb for the UNSW 01 image here: http://www.tuhs.org/Archive/Distributions/UNSW UNSW 01 ------- Tape label: System Source Disk DD format URK? BS=24B count=203 800bpi 9track UNIX System Source 1 of 1 25/1/78 A distribution of UNIX source from UNSW, with several changes. record0.gz is an RK05 image laid out according to the `Boston Children's Museum' format (i-nodes in the middle). Latest file timestamp is Jan 24 1978. There is only kernel source, plus a `unswbatch' directory. The latter seems to hold the source to a UNIX batch system developed by Ian Johnstone and other at the School of Electrical Engineering at UNSW. record0.tar.gz is a tar archive of the RK05 image. Cheers, Warren