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Date: Mon, 3 Feb 2003 18:14:06 -0800
From: Nathan Kinkade <nkinkade@dsl-only.net>
To: freebsd-questions@FreeBSD.ORG
Subject: Re: 200Gig disk shrinks to 124 upon install
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On Mon, Feb 03, 2003 at 04:25:16PM -0800, Kevin Stevens wrote:
> > I casually installed a 200 Gig dis on a 4.3-stable freebsd system.  I
> > quickly followed the directions in
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/disks-
> > adding.html section "12.3.2.2 Dedicated".  df -g now reports that the
> > resulting disk is only 124 Gig, so I'm sad and confused.  I expected
> > some shrinkage, but not quite so much.   ideas?
>=20
> How current is your motherboard?  If it doesn't support the ATA-6 spec
> there's a limit of 120-140GB (don't remember the details.
>=20
> KeS

Yes, this sounds a lot like he's hit the limit of the <ATA5 spec.
Limits were:

cylinders: 65536 (16 bits)
heads: 16 (6 bits)
sectors: 256 (8 bits)
total: 28 bits

2^28 =3D 268435456 addressable sectors

268435456 * 512 =3D 137438953472 bytes / 1073741824 bytes =3D 128 GB

A previous poster already mentioned that the ATA6 spec supports a 48 bit
address, or 256 terabytes.

Nathan

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