format (command)

From Infogalactic: the planetary knowledge core
Jump to: navigation, search
Format
A component of Microsoft Windows
Also available for RT-11, 86-DOS, MS-DOS, PC DOS, OS/2

In computing, format, a command-line utility included in 86-DOS, MS-DOS, IBM PC DOS and OS/2 and Microsoft Windows operating systems, carries out disk formatting. The command is also available in the DEC RT-11 operating system.

The command performs the following actions by default on a floppy disk, hard disk drive, solid state (USB), or other magnetic medium (it will not perform these actions on optical media):

  1. clearing the FAT entries by changing them to 0x00
  2. clearing the FAT root directory by changing any values found to 0x00[nb 1][1][2][3]
  3. checking each cluster to see if it is good or bad and marking it as good or bad in the FAT

Optionally (by adding the /S, for "system" switch), Format can also install a Volume Boot Record. With this option, Format writes bootstrap code to the first sector of the volume (and possibly elsewhere as well). Format always writes a BIOS Parameter Block to the first sector, with or without the /S option.

Another option (/Q) allows for what Microsoft calls "Quick Format". With this option the command will not perform steps 2 and 3 above.[citation needed] Format /Q does not alter data previously written to the media.

Typing "Format" with no parameters in MS-DOS 3.2 or earlier would automatically, without prompting the user, format the current drive; however in MS-DOS 3.3 and later it would simply produce the error: "required parameter missing".

Any storage device must have its medium structured to be useful. This process is referred to[by whom?] as "creating a filesystem" in Unix, Linux, or BSD.[citation needed] Under these systems the command "mkfs" exists. It creates many kinds of file systems, including those used by DOS, Windows, and OS/2.

See also

Notes

  1. The directory entries get filled with 0x00 since MS-DOS 1.25 and PC DOS 2.0. If the Format command line option /O is provided, the first byte of each directy entry is set to 0xE5h to create a FAT format useable by PC DOS 1.0-1.1. However, not giving /O will significantly speed up directory searches under MS-DOS 1.25 and PC DOS 2.0 and higher. Older versions of MS-DOS, PC DOS, and 86-DOS only supported the 0xE5 marker.

References

  1. Lua error in package.lua at line 80: module 'strict' not found. (NB. While the publishers claim this would be MS-DOS 1.1 and 2.0, it actually is SCP MS-DOS 1.25 and a mixture of Altos MS-DOS 2.11 and TeleVideo PC DOS 2.11.)
  2. Lua error in package.lua at line 80: module 'strict' not found. (NB. While the author claims this would be MS-DOS 1.1 and 2.0, it actually is SCP MS-DOS 1.25 and a mixture of Altos MS-DOS 2.11 and TeleVideo PC DOS 2.11.)
  3. Lua error in package.lua at line 80: module 'strict' not found. (NB. While the author claims this would be MS-DOS 1.1 and 2.0, it actually is SCP MS-DOS 1.25 and a mixture of Altos MS-DOS 2.11 and TeleVideo PC DOS 2.11.)

External links