X-Authentication-Warning: delorie.com: mail set sender to opendos-bounces using -f X-Recipient: opendos AT delorie DOT com Importance: normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4325 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: Partitions beyond 7.8G (was: MS-DOS 6.22) Date: Thu, 18 Mar 2010 17:42:25 +1100 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: MS-DOS 6.22 Thread-Index: AcqL0k+FfIJU87YOQzWVTyPLhDdTLg6kTicA From: "da Silva, Joe" To: 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 PLEASE CONSIDER OUR ENVIRONMENT BEFORE PRINTING THIS EMAIL. This e-mail (including any attachments) is confidential and may be = legally privileged. If you are not an intended recipient or an = authorized representative of an intended recipient, you are prohibited = from using, copying or distributing the information in this e-mail or = its attachments. If you have received this e-mail in error, please = notify the sender immediately by return e-mail and delete all copies of = this message and any attachments. Thank you.