Date: Wed, 14 Oct 1998 09:30:15 +0200 (CEST) From: Søren Schmidt <sos@FreeBSD.ORG> To: Marius.Bendiksen@scancall.no (Marius Bendiksen) Cc: sos@FreeBSD.ORG, freebsd-current@FreeBSD.ORG Subject: Re: bitten 3 times already. Message-ID: <199810140730.JAA09355@sos.freebsd.dk> In-Reply-To: <3.0.5.32.19981014083411.00923cd0@mail.scancall.no> from Marius Bendiksen at "Oct 14, 98 08:34:11 am"
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In reply to Marius Bendiksen who wrote:
> >You dont need to run the drive in LBA mode to coexist with DOS or whatever.
> >Also you dont need to run the drive in LBA mode to use >8G, infact using
> >LBA has nothing to do with >8G support. >8G support has something to do
> >with us probing the drive correctly and using it that way.
>
> I know I don't need to run the drive in LBA mode, and that LBA has nothing
> to do with >8G support. I *have* written an IDE driver before, you know.
Great! anything we could use perhaps ??
> What I fail to recall, is whether harddrives that are already LBA formatted
> will lose their data if accessed in CHS mode? Otoh, I suppose we've got
> code to make sure we follow the 'right' layout anyhow..
There is no difference in formatting, its only a question on what
you call the track/head/sector registers, which you should know if
you have written an IDE driver ;)
The only thing thats important is to know the geometry used when the
data was written onto disk, then use that to calculate a sequential
sector number, then recalc that back to the current geometry.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team
Even more code to hack -- will it ever end?
..
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