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From: mw@theatre.pandora.sax.de (Martin Welk)
Subject: Re: Problem With Fujitsu SCSI Drive
Organization: Private Site, Member of Individual Network e. V.
Message-ID: <DHB6Bo.F41@theatre.pandora.sax.de>
References: <814658177.16718@kiss.demon.co.uk> <46mhpe$qok@trout.progroup.com> <DH3H72.EoJ@theatre.pandora.sax.de> <470d95$1gr@uriah.heep.sax.de>
Date: Tue, 31 Oct 1995 10:26:12 GMT
Lines: 34
In article <470d95$1gr@uriah.heep.sax.de>,
J Wunsch <j@uriah.heep.sax.de> wrote:
>>SCSI host adapters see a disk drive as a number of 512k blocks.
>512 bytes, actually. :-)
Oh, of course. Sorry.
>>Ah, and what we shouldn't forget: older Adaptec 1542B BIOSes (like
>>mine) cannot handle drivers over 1 gig. You need a BIOS update,
>>which is freely available on their ftp server and their BBS (at
>>least, here in Germany it is.)
>But that's only relevant for BIOS access (for DOS, or to access the
>/kernel inside the FreeBSD root partition).
Yes, but what happens if the BIOS the FreeBSD /kernel think of
different geometries? If the SCSI host adapter addresses the disk
in a similar way the driver does, the BIOS would only talk with
the _first_ gigabyte. If it doesn't, it may use parts of the
logical geometry that overlap with the geometry the kernel thinks
of. Hmm... Difficult to explain, I see :-)
Has somebody made any experiences running a > 1 gig drive with
an older BIOS on an Adaptec 1542B or comparable using it with
FreeBSD and some BIOS-using operating system like DOS?
Bye,
Martin
--
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