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Subject:	RE: Partitions beyond 7.8G (was: MS-DOS 6.22)
Date:	Thu, 18 Mar 2010 17:42:25 +1100
Message-ID:	<F5FE23FC719F024FA7222F75574886E70E52A6@ausydsv02.ap.bm.net>
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Thread-Topic:	MS-DOS 6.22
Thread-Index:	AcqL0k+FfIJU87YOQzWVTyPLhDdTLg6kTicA
From:	"da Silva, Joe" <Joe DOT daSilva AT landisgyr DOT com>
To:	<opendos AT delorie DOT com>
X-OriginalArrivalTime:	18 Mar 2010 06:42:25.0819 (UTC) FILETIME=[2BDA96B0:01CAC666]
Reply-To:	opendos AT delorie DOT com

Hi all,

Interesting ... Just noticed the send date was 2009/10/2,
yet the receive date was 2010/1/3 ... snail mail ???

Anyway, LBA addressing for MS-DOS started at 7.00
(W95). Later, FAT32 support was added at 7.10 (W95A).

If your BIOS has eXtended Int $13 functions and your DOS
supports LBA, you can exceed the 7.8G barrier, provided
your partition type is LBA (eg. FAT16x or FAT32x) or is
a traditional partition type within an LBA extended
partition. Ignoring BIOS bugs (eg. Award 4.51PG), the
next barrier is 128G.

However, there are some nasty LBA bugs in the MS-DOS 7.XX
(also 8.00) implementation when you have both CHS and LBA
partitions. Steven Saunderson made a patched 'IO.SYS' to
correct these bugs, but I have just found it can introduce
problems with some partition combinations. I have reversed
one of his changes, and have a revised patch available via
my web page : http://jds.com-t.com/general.html

Joe.

>=20

Joe da Silva
Senior Electronic Engineer
Landis+Gyr
Phone: +61 2 9690 7309
joe DOT dasilva AT landisgyr DOT com
http://www.landisgyr.com/

Manage Energy Better-----Original Message-----
> From: Mike Tripp [mailto:ccoky AT iglou DOT com]
> Sent: Friday, October 02, 2009 12:44 AM
> To: opendos AT delorie DOT com
> Subject: MS-DOS 6.22
>=20
>=20
> Originally to: Kevin Klement
>=20
> Hello Kevin!
>=20
> 30 Sep 09 17:27, Kevin Klement wrote to mark lewis:
>=20
>  KK> I know MS-DOS FAT16 can only partition 2GB drive, I have=20
> a 200GB drive
>  KK> and I want to use MS-DOS 6.22 on it, and make some extended
>  KK> partitions, you know may be C: D: E: F: etc...
>=20
>  KK> I had a program called EZ-BIOS to fool the BIOS into=20
> doing this, but I
>  KK> cant find it, any suggestion on a good program to do this?
>=20
> Your BIOS doesn't support LBA or does 200GB surpass a limit=20
> to the LBA=20
> implementation?  I remember the wall at 8GB, but I don't=20
> think I've ever=20
> installed DOS on more than a 10GB.  All that needed was a new=20
> enough BIOS with=20
> LBA support and maybe "yes" to large disk support prompt in=20
> FDISK, which I think=20
> came later after 6.22.
>=20
> For software solutions, both Seagate and WD have bundled=20
> Ontrack and similar=20
> with the retail versions of their HDs.  If you don't have a=20
> recent utility CD,=20
> they can probably be downloaded from the HD vendor's sites. =20
> They are usually=20
> crippled to work specifically with the source vendor's drives=20
> though, so hit the=20
> right site.  Never had to use them myself, so can't vouch for=20
> the results.
>=20
> .\\ike
>=20
>=20
>=20
>=20
>=20

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