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From: "Leonard N. Zubkoff" <lnz@dandelion.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Q) Seagate geometry
Date: 15 Sep 1995 13:31:08 -0700
Organization: Dandelion Digital
Lines: 20
Sender: lnz@dandelion.com
Message-ID: <43cnqc$pq@kelewan.dandelion.com>
References: <KEN.95Sep13083132@tyd1.tydfam.iijnet.or.jp> <438vpv$cng@bonnie.tcd-dresden.de> <KEN.95Sep15234818@tyd1.tydfam.iijnet.or.jp>
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In-reply-to: ken@tyd1.tydfam.iijnet.or.jp's message of Fri, 15 Sep 1995 14:48:18 GMT
In article <KEN.95Sep15234818@tyd1.tydfam.iijnet.or.jp> ken@tyd1.tydfam.iijnet.or.jp (ken) writes:
j@bonnie.heep.sax.de (J Wunsch) writes:
> You don't need the disk geometry, you need the geometry your BIOS
> assumes the disk were. For Adaptec, this is N * 32 * 64, with N being
> the actual number of full megabytes (2^20 bytes) the disk has.
Thank you for your response, J"org. However, my Buslogic BT-946C
doesn't work that way. Even giving correct geometry, 2707/19/81, it
complains. Is it specific problem (bug?) with BT-946C?
The BusLogic 946C BIOS will report one of three possible geometries
depending on the size of the disk and whether or not the > 1 GB option is
set in Auto-SCSI. With the switch not set, the geometry will be 64 heads
and 32 sectors/track along with the appropriate number of cylinders; if the
> 1 GB option is set, then drives between 1GB and 2GB use 128 heads and 32
sectors/track, and larger drives use 255 heads and 63 sectors/track.
Leonard