The Master Boot Record is an important part of your hard disk drive. FIXDISK.EXE is a simple command line utility designed to safely remove unknown boot sector viruses while providing a virus data file for analysis and recovery.
|FIXDISK will save the first track of the disk to a data file. If this file is created before a virus infection, it can be used as a rescue file. Also, should you encounter a new virus that cannot be disinfected, please send us the saved file and our development team will analyze it and update F-PROT.|
During the installation process, F-PROT instructs FIXDISK to save the MBR as a hidden RESCUE file in the root directory. This file is called F-PROT.SYS and it can be used by FIXDISK to repair the damage done by a boot sector or MBR virus.FIXDISK SWITCH OPTIONS
If nothing is specified, FIXDISK offers the following options.
|REPAIR||Attempts a generic repair of the MBR.|
|UNDO||Replaces the MBR with a rescue file.|
|FIND||Searches drive for a rescue file.|
|RESCUE||Used with the following switches for saving and restoring a rescue file
CREATE Creates a file that contains the MBR and boot sector
RESTORE Asks for a filename to repair an MBR and/or boot sector.
Should you encounter an unknown virus that cannot be disinfected, you can use the FIND command to restore the infected MBR from the data file created by RESCUE. This will allow access to your valuable data files.
This will attempt a generic repair of the MBR. Should this fail, it will search the hard drive for a rescue file. For example:FIXDISK REPAIR C:
The "Save" command will take an image of the first track of the drive and the boot sector. This is the preferred method to use if sending Command Software a suspected virus sample for analysis.
This will skip the generic repair and search for the rescue file on the hard drive. This search is done on a track-by-track basis and may take some time.FIXDISK FIND
This command is used to create and restore a rescue file.
CREATE produces a rescue file that contains an image of the MBR and the boot sector of all physical hard drives. If a filename is specified, that will be used. Including a floppy drive letter creates the F-PROT.SYS file on that drive. For example:The F-PROT.SYS hidden, system, read-only file will be created on the root directory of the boot drive. This file contains not only the MBR and boot sector of the boot drive, but the MBRs of any other physical hard drives in the system.FIXDISK RESCUE CREATE
To create a similar file called RESCUE.DAT on drive A: type:To create a rescue file called TEST.DAT on drive A: type:FIXDISK RESCUE CREATE A:FIXDISK RESCUE CREATE A:TEST.DAT
This will prompt you for a rescue filename to use to recover the MBR and boot sector.FIXDISK RESCUE RESTORE
Should attempts to disinfect a boot sector virus fail, check the CMOS setup of the infected system. Some boot sector virus variants will attempt to protect themselves by modifying the CMOS in two ways:
The FIXDISK utility safely disinfects a boot system virus in two different ways. The easiest is with a previously created STARTUP diskette and the second is used if you have just attempted to install F-PROT and have detected a pre-existing boot sector virus.
FIXDISK RESCUE RESTORE
F-PROT /HARD /DISINF
|Note that FIXDISK will only repair MBR viruses that have not modified the partition table.|