From: "da Silva, Joe" <Joe.daSilva@landisgyr.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.



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

Manage Energy Better-----Original Message-----

From: Mike Tripp [mailto:ccoky@iglou.com]
Sent: Friday, October 02, 2009 12:44 AM
To: opendos@delorie.com
Subject: MS-DOS 6.22

Originally to: Kevin Klement

Hello Kevin!

30 Sep 09 17:27, Kevin Klement wrote to mark lewis:

I know MS-DOS FAT16 can only partition 2GB drive, I have

a 200GB drive

and I want to use MS-DOS 6.22 on it, and make some extended
partitions, you know may be C: D: E: F: etc...

I had a program called EZ-BIOS to fool the BIOS into

doing this, but I

cant find it, any suggestion on a good program to do this?

Your BIOS doesn't support LBA or does 200GB surpass a limit
to the LBA
implementation? I remember the wall at 8GB, but I don't
think I've ever
installed DOS on more than a 10GB. All that needed was a new
enough BIOS with
LBA support and maybe "yes" to large disk support prompt in
FDISK, which I think
came later after 6.22.

For software solutions, both Seagate and WD have bundled
Ontrack and similar
with the retail versions of their HDs. If you don't have a
recent utility CD,
they can probably be downloaded from the HD vendor's sites.
They are usually
crippled to work specifically with the source vendor's drives
though, so hit the
right site. Never had to use them myself, so can't vouch for
the results.

.\\ike

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