*BSD News Article 51552


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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
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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