FDISK.EXE is a DOS based command line driven Microsoft
partitioning utility. Its purpose is to display boot, disk and partition
information, modify existing partitions, create new ones and/or delete the ones
you want on all installed fixed hard disk(s), but ONLY WITH COMPLETE DATA LOSS!

run one of these commands from any DOS prompt:

FDISK /?

or:

HELP FDISK

to display the FDISK.EXE help screen.

HIDDEN PARAMETERSHidden parameter are not documented by Microsoft and is find by users threw
experiments.

1) FDISK /FPRMT :

FDISK /FPRMT bypasses the FDISK startup screen, but enables interactive
FAT16/FAT32 support. This can be used to force FDISK to create FAT32 partitions
smaller than 512 MB, normally not possible by default.

2) FDISK /MBR :

FDISK /MBR recreates the boot sector of the first (bootable) hard disk
overwriting it with a fresh copy, by writing a new Master Boot Record (MBR)
based on existent disk structure, without altering the partition table
information.

Can be used to repair a damaged/corrupted MBR (i.e. by a virus).

FDISK /ACTOK skips disk integrity checking, thus speeding up the
partitioning process.

3) FDISK /ACTOK :

4) FDISK /PARTN :

FDISK /PARTN saves the partition information to a plain text file called
PARTSAV.FIL, which can be viewed afterwards using any text editor/viewer, like
EDIT.COM in DOS or Notepad in Windows.

Formatting Partitions

FORMAT.COM is an external MS-DOS command,
located by default in C:\Windows\Command

Hidden Parameter :

Hidden parameter are not documented by Microsoft and is find by users threw
experiments.

1) FORMAT /AUTOTEST :

FORMAT /AUTOTEST checks for the existing format of your disk, unless the /U
(UNCONDITIONAL) parameter is also used, and then proceeds with an UNATTENDED
DISK(ETTE) FORMAT:

DOES NOT prompt for a volume label!

DOES NOT prompt to format another disk(ette)!

NO delay: NO user intervention!

Ends WITHOUT pausing!

After completion, it DOES display disk space statistics.

2)FORMAT drive: /U :

FORMAT drive: /U performs an UNCONDITIONAL format, which DESTROYS every byte of
data on ANY hard disk/floppy by overwriting it with zeroes (hex F6h).

3) FORMAT drive: /SELECT /U :

FORMAT drive: /SELECT /U makes a disk(ette) UNREADABLE by filling the system
area (sector 0) with zeroes (hex F6h), due to using these two incompatible
options together. All other sectors are left intact.

95/98/NT SETUP SWITCHES

If you try to install Windows 95/98 from a DOS
prompt, SETUP allows several command line switches, also available to their
Windows GUI based counterpart.

Note that most switches are NOT case sensitive.

Run SETUP /?:

it will show the available parameters.

UNDOCUMENTED SETUP SWITCHES:

/IP Bypasses detection of undocumented plug and play
devices.

/IR Bypasses detection of system
CMOS/BIOS and does not update Master Boot Record (MBR).It is very helpful in
installing windows on the system on which LINUX is already installed

/IW Bypasses Microsoft EULA licensing
screens/dialog boxes.

/NTLDR Bypasses existing Operating
System detection.

WIN.COM HIDDEN PARAMETERS

WIN.COM is the Windows GUI (Graphical User
Interface) command line executable,

located in C:\Windows (default)

Hidden Parameter :

Hidden parameter are not documented by Microsoft and is find by users threw
experiments.

1.) win/W [Windows 95 and above ONLY]

win/W generates this message:

“Press any key to continue…

Pressing a key reboots the system back to Windows 95 (98).”

waiting for user input (key press), and then restarts the computer (warm
reboot), restoring the original CONFIG.SYS and AUTOEXEC.BAT files in the root
directory of the boot drive from CONFIG.WOS and AUTOEXEC.WOS (if any).

This is useful when the computer is restarted after interrupting a “single” mode
MS-DOS session, because of this CONFIG.SYS line:

DOS=SINGLE

which does NOT allow Windows 95/98 GUI to load. This switch works ONLY if
executed from the native/real/true MS-DOS mode OUTSIDE the Windows 95/98 GUI,
NOT from WITHIN Windows in a DOS box/session.

2.)win/Z [Windows 95B
OSR 2.1 and above ONLY]

win/Z automatically forces the ATX power supply to
(soft-)power off the

computer ONLY on ATX motherboards, without prompting or waiting for input (key

press).

This switch works ONLY if executed from the native/real/true MS-DOS mode

OUTSIDE the Windows GUI, NOT from WITHIN Windows in a DOS prompt/box/session.