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PASSWORD.ARJ
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PWMBR.DOC
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1992-12-20
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PWMBR 2.0
Copyright (C) 1992 Lonnie L. Logue
-- AN MBR PASSWORD SYSTEM --
FEATURES
1. Prevents computer access without a valid password.
2. Disables floppy diskette boots.
3. CRC testing of the PWMBR Master Boot Record.
4. Creates a utility diskette that will restore the PWMBR
Master Boot Record and the original relocated MBR in the
event they become damaged or relocated by a boot sector
virus or other program.
*** WARNING ***
If you forget your password you will not be able to access
either your hard or floppy drives.
Remove this program before modifying your system in any way.
You can reinstall after you are certain that your computer is
operating properly.
If you are having ANY difficulties with your hard drive, DO NOT
INSTALL this program!
Use ONLY fresh PWMBR 2.0 files extracted from PWMBR20.ZIP!
Because of the boot sector virus problem, it is a MUST that you
create a utility diskette immediately after installation.
READ AND UNDERSTAND the DISCLAIMER!
COMPATIBLES
This program has been tested on IBM compatibles under the
following conditions:
Operating Systems: MS-DOS 3.3
MS-DOS 4.01
MS-DOS 5.0
DR DOS 6.0
Hard Drive types: IDE
MFM
If your hard drive type is NOT listed above, DO NOT USE this
program unless you are willing to experiment!
NOTE: This product is not compatible with Microsoft Windows
running in 32 bit disk access mode.
INSTALLATION AND USE
Syntax: PWMBR [switch]
Switch: /i = install /c = change password
/r = remove /u = create utility disk
/t = test
1. INSTALL
Installs PWMBR to the hard drive. Forces warm boot.
2. REMOVE
Removes PWMBR from the hard drive. Requires entry of
the current password. Forces warm boot.
3. CHANGE PASSWORD
Changes the password. Requires entry of the current
password.
4. CREATE UTILITY DISK
Creates a utility diskette that will restore the PWMBR
Master Boot Record and the original relocated MBR in the
event they become damaged or relocated by a boot sector
virus or other program. Requires entry of the current
password.
To use the utility diskette, power down the system and
place the write protected PWMBR utility diskette into
drive A: and then boot the system as normal.
It is recommended that you have a minimum of two utility
diskettes stored in a secure location. DO NOT forget
the password that was in use when these diskettes were
created as you WILL have to enter it after the restore.
NOTE: The utility diskette checks the machine ID string
to avoid restoring the resident program to another
computer. While normally this is effective, in a
business environment where numerous computers of
the same model are purchased at the same time,
there can be problems unless the hard drives are
partitioned identically and are running the same
versions of DOS. DO NOT boot from the utility
diskette UNLESS it was created on that computer.
Always write the serial number of the computer on
the utility diskette label and WRITE PROTECT the
diskette. Do NOT copy anything to the PWMBR
utility diskette as it is not a DOS diskette and
will be damaged.
5. TEST
Runs a CRC test on the PWMBR Master Boot Record. If the
test fails, use your utility diskette to restore.
NOTE: This does NOT test the executable file PWMBR.EXE.
To be sure this file is not corrupt, periodically
extract a fresh copy from PWMBR20.ZIP.
ERROR MESSAGES
1. REQUIRES DOS VERSION 2.0 OR ABOVE
DOS version 2.0 or above is required for the operation
of this program.
2. FIXED DISK NOT PRESENT OR INVALID
There is no fixed disk on this system, or it is
invalid.
3. INVALID PARTITION TABLE
PWMBR 2.0 will only install onto systems that have a
standard 512 byte Master Boot Record which contains a
valid, bootable Partition Table.
4. NOT COMPATIBLE WITH BIOS
PWMBR is not compatible with the system bios. If PWMBR
is already installed and you receive this message, it's
a good indication that PWMBR has been either damaged or
relocated by a boot sector virus or other program. If
you believe this to be the case, power down the system
and then boot from your write protected PWMBR utility
diskette. This will remove the virus, however it is
advised that you scan your floppy diskettes for boot
sector viruses or you'll run the risk of reinfection.
5. HANDLER ERROR, PLEASE REBOOT
The memory resident interrupt handler which protects
PWMBR from unauthorized modifications is missing or has
been corrupted. Reboot the computer and try again.
If rebooting didn't solve the problem, it's possible
that PWMBR has been damaged by a boot sector virus or
other program. Power down the system and then boot from
your write protected PWMBR utility diskette.
6. CRC TEST PASSED
The PWMBR Master Boot Record has passed a CRC test
and can be considered intact.
7. CRC TEST FAILED
The PWMBR Master Boot Record has failed a CRC test
indicating it has been damaged.
To repair, power down the system and then boot from your
write protected PWMBR utility diskette.
8. PWMBR ALREADY INSTALLED
PWMBR is already installed. Use the /r switch to
remove.
9. PWMBR NOT INSTALLED
PWMBR is not installed. Use the /i switch to
install.
10. MBR LOAD ERROR
This error message will be displayed upon system bootup
after the password has been entered and accepted. It
means a disk sector error has occured or that the
secondary MBR has an invalid signature. This error
should normally not occur, unless you are having
problems with your hard drive.
If you receive this error message, power down the system
and then boot from your write protected PWMBR utility
diskette. A restore error while booting from the PWMBR
utility diskette indicates a problem with the hard drive.
UPDATES
1.0 ........... Initial release of this program.
Dated 09-12-92 1:00:00am
2.0 ........... Bugfix - corrected problem PWMBR10 had with
partition tables that booted from other than the
1st partition. Password is now required to make
a utility diskette.
Dated 12-20-92 2:00:00am
DISCLAIMER
This is a potentially dangerous product in that if the password
is forgotten, or the user modifies the system without first
removing PWMBR and the system because of this modification fails
to boot, or PWMBR becomes corrupted on the disk and a restore
utility diskette was not created, or if PWMBR for any reason is
not compatible with the system, the hard and floppy disks will
NOT boot thus effectively locking the user out of their computer.
NO DISK DATA will be destroyed, but the hard drive may have to
be removed and subjected to data recovery techniques by either
the user or a professional service.
It is assumed that you have read and fully understand all
warnings stated above. It is also assumed that you will hold no
persons responsible for any and all consequences of using this
program.
SOFTWARE LICENSE
Copyright (C) 1992 Lonnie L. Logue
This product is SHAREWARE! You may use PWMBR.EXE without charge
for an evaluation period not to exceed 30 days. Continued use
after the evaluation period requires registration. Use of this
software, registered or not, is NOT permitted unless the following
conditions are agreed to:
1. No fee is charged for use, copying or distribution.
2. It is not modified in any way.
3. The above disclaimer is read, understood, and
agreed to.
If you find this program useful, a $10 registration would be
appreciated. Please send CASH, check or money order to:
Lonnie L. Logue
9231 Goldenrod Lane
Upper Marlboro, MD 20772
-EOF-