home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Magnum One
/
Magnum One (Mid-American Digital) (Disc Manufacturing).iso
/
d16
/
win30_dm.arc
/
WIN30_DM.TXT
< prev
Wrap
Text File
|
1991-10-07
|
5KB
|
97 lines
(This open letter was written by Ontrack Computer Systems, and is
posted here at the Seagate Tech Support BBS as a courtesy to users
of the Disk Manager software program)
-----------------------------------------------------
ONTRACK
Computer Systems, Inc.
To : Windows 3.0 and Disk Manager users
From : Ontrack Computer Systems
Re : Windows 3.0 and Disk Manager
Ontrack Computer Systems is very concerned about reports of data
corruption on systems which are using MicroSoft Windows 3.0. We
are devoting a great deal of time and effort to track down this
reported problem, but are unable to produce even one byte of
corrupted data on any of our computers running Windows 3.0. We
have determined the following to be true and verifiable:
1. If Windows 3.0 is used on a 386 computer which has a hard drive
with more than 1024 cylinderas and our DMDRVR.BIN is being used to
allow DOS (and of course Windows) to access that portion of the
disk, then the "[386enh]" section of the SYSTEM.INI file in Windows
must contain the following line:
VIRTUALHDIRQ=OFF
See pages 528-9 in the index of the Windows Users Guide for examples
on how to modify SYSTEM.INI.
NOTE: Many ESDI drives exceed the 1024 cylinder barrier but due to
a translating controller card, appear to the operating system to
have fewer than 1024 cylinders. Such a drive is not considered to
have more than 1024 cylinders and does not fall into the category
described above. This is because our SWBIOS.COM utility is not
required to set up the drive and the DMDRVR.BIN will also not
utilize that portion of the driver.
2. The Swapfile program, which is used to set up a permanent swap
file on the disk, checks for ANY partitioning device driver
including the DMDRVR.BIN in the CONFIG.SYS file and will not run if
it exists. The swap files are hard-coded to use a 512 byte sector
and in DOS versions earlier than 4.0, Disk Manager increased the
logical sector size to allow access to partitions greater than 32
megabytes. Since this is the case, a permanent swap file cannot be
used on a disk using the DMDRVR.BIN device driver though temporary
swap files will work just fine.
Using a temporary swap file instead of a permanent one should not
degrade performance on a disk that has an optimization utility run
on a regular basis.
Running such a utility is a good idea anyway for general system
performance as well as increasing the possibility of recovering data
should your system encounter some sort of problem.
3. Finally, on page 53 of the Windows User's Guide, users are
cautioned against running CHKDSK /F as well as any other utility
that will modify the file allocation tables (FAT). The utilities
mentioned in this section of the Windows User's Guide are designed
to operate in a single-tasking environment and include such things
as undelete or optimization utilities.
In the multi-tasking environment created by Windows, there may be
many programs creating, manipulating and deleteing files. While
these operations are in process, the FATs will not be accurate.
When the operation is complete, the FAT will accurately reflect that
operation. Since there are (or at least could be) multiple programs
running simultaneously, another application could be in the middle
of an operation at any given point in time.
Since the file structure is constantly in a state of flux, any
utility that assumes the structure to be static (unchanging) could
cause problems if run in this multi-tasking environment. Be safe,
run your applications from within Windows and your utilities before
entering or after exiting Windows.
NOTE: These utilities can be run successfully after exiting
Windows or before running Windows; the caution only applies while
Windows is running. Going to the DOS prompt from within Windows is
not the same as exiting Windows and the caution will still apply.
Windows has brought to the PC environment power that has previously
only been available in mainframe and mini computer environments.
Even though Windows makes it look like computing just got simpler,
with this increased power comes increased complexity. As users we
need to be aware of this and take precautions such as backing up
our data before we get on with 'business as usual'.
In as much as data integrity is the cornerstone of our software
family, we will continue to verify the compatibility of Disk Manager
and Windows 3.0 (not to mention other software packages). In the
event that you or someone you know has actually experienced data
corruption, we ask that you help us by calling our BBS at
612-937-0860 and filling out our Windows Survey form.