Date: Fri, 17 Nov 1995 02:34:16 -0800 (PST) From: Julian Elischer <julian@ref.tfs.com> To: aspray@faceng.newcastle.edu.au (Andrew Spray) Cc: questions@FreeBSD.org Subject: Re: Handling disk translations with more than 16 heads? Message-ID: <199511171034.CAA03776@ref.tfs.com> In-Reply-To: <199511170937.AA12031@venus.newcastle.edu.au> from "Andrew Spray" at Nov 17, 95 08:37:29 pm
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there are ways of "fiddling" this.. how much room do you want to allocate to which OS? looks like a 2GB drive right? If you only need to be able to give DOS 480MB or so, then you can use a 16 head translation, and put the root part of the BSD part from 480 to 500 MB Once FreeBSD is up and running it'll be able to use all those extra cyls alternatively, you CAN make FreeBSD and DOS work on differnt geometries.. (basically the boot blocks work on whatever the BIOS uses and in the translation to the kernel you CAN make it use a differnt geometry (well you USED TO BE ABLE to.. (I'll have to go look at a few things)) but even back when I used to do such terrible things you had to REALLY know what you were doing.... I believe this has been fixed in 2.1 > > Summary: Where can I find documentation on how to deal with > disk translations incorporating >16 heads? > > > Hi, > > I am attempting to install FreeBSD 2.0.5 Release onto a disk > which has head/track/sector translation. My translation has > a large number of heads (>16) so that I can have some large > DOS (apologies) partitions. I believe that I am having > difficulties because of the numbers of heads. Could you > please advise me of the manuals I should be reading to > overcome this problem. > > I have a degree of control over the translation, and FreeBSD > appears to install correctly with 16 heads or less (but this > limits the total apparent disk area I have available). Further, > I have written at some point to most of the disk successfully > with DOS, so the medium seems OK. > > In case I am barking up the wrong tree, I include (what > appear to be) the relevant areas of debug messages. > > (As you can see the geometry is 64 hds, 1024 trks, 63 secs > - ideally I would like something of the order of 123 hds, > 737 trks, 46 secs (what my controller card recommends)). > > BIOS: AMI (1990) > Disk controller: Longshine Electronics v 2.A1 LCS-6633(F) > > > DEBUG: ioctl(3, TIOCCONS, NULL) = 0 (success) > wd0: can't handle 64 heads from partition table (truncating to 16) > DEBUG: Found a device of type disk named: wd0 > >
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