Microsoft DOS fdisk command
MS-DOS 3.3x and below used fdisk.com
MS-DOS 4.x and above, including Windows use fdisk.exe
The fdisk command is an external command that is available in the below Microsoft operating systems.
Configures a hard disk for use with MS-DOS.
FDISK [/STATUS] /X
|/STATUS||Displays partition information.|
|/X||Ignores extended disk-access support (will not use LBA support). Use this switch if you receive one of the below symptoms.
Unable to access a drive from DOS versions prior to 7.
Secret fdisk switches
Disclaimer: Below is a listing of secret or undocumented MS-DOS fdisk commands and switches. Use these commands at your own risk.
|FDISK /MBR||Command used to rewrite the Master Boot Record. Additional information about fdisk /mbr.|
|FDISK /CMBR <DISK>||Recreates the Master Boot Record on specified disk. Performs the same functions as FDISK /MBR except can be used on other disk drives.|
|FDISK 1/PRI:100||Creates a 100MB DOS partition on the hard drive.|
|FDISK 1/EXT:500||Creates a 500MB meg extended DOS partition on the hard drive.|
|FDISK 1/LOG:250||Creates a 250MB logical drives on the hard drive.|
|FDISK /Q||Prevents fdisk from booting the system automatically after exiting fdisk.|
|FDISK /STATUS||Shows you the current status of your hard drives.|
|FDISK /ACTOK||Makes FDISK not check the disk integrity allowing the drives to be created faster.|
|FDISK /FPRMT||Prevent the prompt for FAT32 support and allows FDISK to be forced into using FAT32 on drives smaller than 540MB. By default FDISK does not use FAT32 on any drive smaller than 540MB. Finally this command can only be used with FDISK that supports FAT32.|
Open the fdisk option screen that you can see in the fdisk simulation.
Note: If any partition is deleted everything within that partition will be erased.
See the fdisk simulation for additional information and examples.
Fdisk script file - Fdisk has the capability of being run from an external file, allowing you to quickly create and delete partitions through fdisk. To do this, create a file from the DOS edit command. Below are the steps required in generating this file.
Edit fdisk.scr - This will place you within the edit screen. Within this screen you will enter the commands you want to be run in fdisk. For example, if you want to run fdisk and display the partition information, you would enter 4.
Because fdisk requires you to press enter after a selection, press Ctrl + P and then press Ctrl + M to create a music symbol, which acts as a carriage return.
If you need to press the esc key, you would use Ctrl + P and then press esc, which would be represented as a backwards arrow.
When doing the commands to run FDISK, all these must be on one line; do not place each command on separate lines.
Once you have created the script file, you can then type fdisk < fdisk.scr that will then execute the script file. If the script file encounters an error during its process, you need to recreate the script file where the mistake occurred.
|CHSIZE||Unable to see full amount of hard drive.|
|CH000032||Only able to see 2 Gig partition/drive.|
|CH000175||Do you have any additional information on FDISK /MBR?|
|CH000226||Partition shows up as an MS-DOS partition.|
|CH000229||Invalid / Non System Disk error.|
|CH000231||Invalid media type reading drive C:|
|CH000340||No fixed disk present.|
|CH000344||How to delete a partition using fdisk.|
|CH000345||How to create a partition using fdisk.|
|CH000355||How to lock and unlock the hard drive.|
|CH000379||Error reading/writing fixed disk.|
|CH000431||How many partitions can DOS and Windows recognize.|
|CH000452||How to create a FAT32 partition.|
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