To: opendos AT delorie DOT com References: <6A645B7068B AT reze-1 DOT rz DOT rwth-aachen DOT de> Organization: Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Science Message-Id: From: pavel AT insect DOT mail DOT iephb DOT ru (Pavel V. Ozerski) Date: Thu, 23 Dec 1999 17:29:04 +0300 (MSK) X-Mailer: dMail [Demos Mail for Windows NT v1.4b1] Subject: How to find another partitions (was: Re: ) Lines: 74 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Reply-To: opendos AT delorie DOT com I use NT boot manager which does not change MBR. But only C: was visible and another logical drives become hidden BEFORE installing NT, just after I made DR-DOS SYS C: command and replaced scrap of Win'95 given by seller to DR-DOS 7.03. Norton utilities 8.0 DiskEdit reported about my partition table: ----------------------------------------------------------------------------- | | | Starting Location | Ending Location | Relative |Number of | |System|Boot|Side Cylinder Sector|Side Cylinder Sector| Sectors | Sectors | |BIGDOS| Yes| 1 0 1 | 254 260 63 | 63| 4192902| |? | No | 0 261 1 | 254 1022 63 | 4192965| 22346415| |unused| No | 0 0 0 | 0 0 0 | 0| 0| |unused| No | 0 0 0 | 0 0 0 | 0| 0| ----------------------------------------------------------------------------- >On Mon, 20 Dec 1999 Pavel V. Ozerski wrote: > >> Seller created 7 logical FAT16 drives which were avalaible from MS- >> DOS part of Win'95. But I tried to restore my favourite >> configuration: Windows NT 4 as main system and DR-DOS 7.03 as 'first >> aid system'. Now NT works successfully and can use all existing >> logical drives but DR-DOS knows only about drive C: How to make >> another partitions (even if several) to be visible from DR-DOS? > >Hm, if these subsequent partitions are logical drives in an extended >partition, and are (still) formatted with FAT16, DR-DOS should see >them. If it doesn t, I have the suspicion that either NT has >transformed them into NTFS partitions, or that NT has removed >EZ-DRIVE from the MBR (because MS setup programs usually don t care >much of other OSes installed, or because NT does not need EZ-DRIVE >to access the full disk). If this is the case, you would need to >reinstall EZ-DRIVE (or at least refresh the MBR code). I am not used >to EZ-DRIVE, but a similar product (Ontrack DiskManager) provides >such a facility. >Depending on how you switch between the two OSes, there might be >another cause for the problem. You can use NT s FlexBoot Loader >and/or DR-DOS LOADER to switch between them. Since the DR-DOS >LOADER resides in the MBR, installing LOADER might have removed >the EZ-DRIVE MBR. In this case, you should remove LOADER again >(this should reinstall the old MBR, that is the EZ-DRIVE MBR, if >it wasn t changed by NT setup). Once you have the EZ-DRIVE MBR code >refreshed, you should boot from hard disk, but break the boot process >when the EZ-DRIVE MBR code displays its startup message (at least >Ontrack s DiskManager has such a startup banner) before any OS or >boot loader will be loaded. There should be an option to continue >booting of a floppy disk. Once you have booted DR-DOS from floppy >this way, you should reinstall the DR-DOS LOADER again. But remember, >just the usual floppy boot right from the start won t do, as the EZ- >DRIVE MBR code won t be loaded this way. >But since the EZ-DRIVE MBR was from harddisk loaded before the >floppy boot, you already have LBA and >8GB support at this stage. >Any hard disk access should then go through the EZ-DRIVE code in >memory. This means that accessing the MBR and boot sector (and >any other sector) will not necessarily access the same physical >sector, but a translated "virtual" sector as emulated by EZ-DRIVE. >Hence, the DR-DOS LOADER will not actually install into the >physical MBR (and thereby remove EZ-DRIVE again), but will into >the "virtual" MBR as seen under EZ-DRIVE. This would allow peaceful >coexistance and thereby easy switching between NT and DR-DOS (with >EZ-DRIVE still active). > >Please tell us, if this could help you any further. > >Matthias > > >------------------------------------------------------------------- >Matthias Paul, Ubierstrasse 28, D-50321 Bruehl, Germany >eMail: >Web : http://www.rhrz.uni-bonn.de/~uzs180/mpdokeng.html >------------------------------------------------------------------- >