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Format

Formats the disk in the specified drive to accept Windows NT files. You must be a member of the Administrators group to format a hard drive.

format drive: [/fs:file-system] [/v[:label]] [/a:unitsize] [/q] [/f:size] [/t:tracks /n:sectors] [/1] [/4] [/8]

Parameters

drive:

Specifies the drive containing the disk you want to format. If you do not specify any of the following switches, format uses the drive type to determine the default format for the disk.

/fs:file-system

Specifies the file system to use, FAT or NTFS. Floppy disks can use only the FAT file system.

/v:label

Specifies the volume label. If you omit the /v switch, or use it without specifying a volume label, Windows NT prompts you for the volume label after the formatting is completed. Use the syntax, /v: to prevent the prompt for a volume label. If you format more than one disk by using one format command, all of the disks will be given the same volume label. The /v switch is not compatible with the /8 switch. For more information about disk volume labels, see the dir, label, and vol commands.

/a:unitsize

Specifies the allocation unit size to use on NTFS disks. Use one of the following values for unitsize. If unitsize is not specified, it will be choosen based on disk size.

512
Creates 512 bytes per cluster, 1024 bytes per file record. Default if disk is less than 512 meg.
1024
Creates 1024 bytes per cluster, 1024 bytes per file record. Default if disk is 512MB to 1G.
2048
Creates 2048 bytes per cluster, 2048 bytes per file record. Default if disk is 1G to 2G.
4096
Creates 4096 bytes per cluster, 4096 bytes per file record. Default if disk is over 2G.

/q

Deletes the file table and the root directory of a previously formatted disk, but does not scan the disk for bad areas. You should use the /q switch to format only previously formatted disks that you know are in good condition.

/f:size

Specifies the size of the floppy disk to format. When possible, use this switch instead of the /t and /n switches. Use one of the following values for size:

160 or 160k or 160kb
160K, single-sided, double-density, 5.25-inch disk

180 or 180k or 180kb
180K, single-sided, double-density, 5.25-inch disk

320 or 320k or 320kb
320K, double-sided, double-density, 5.25-inch disk

360 or 360k or 360kb
360K, double-sided, double-density, 5.25-inch disk

720 or 720k or 720kb
720K, double-sided, double-density, 3.5-inch disk

1200 or 1200k or 1200kb or 1.2 or 1.2m or 1.2mb
1.2-MB, double-sided, quadruple-density, 5.25-inch disk

1440 or 1440k or 1440kb or 1.44 or 1.44m or 1.44mb
1.44-MB, double-sided, quadruple-density, 3.5-inch disk

2880 or 2880k or 2880kb or 2.88 or 2.88m or 2.88mb
2.88-MB, double-sided, 3.5-inch disk

20.8 or 20.8m or 20.8mb
20.8-MB, 3.5-inch floptical disk

/t:tracks

Specifies the number of tracks on the disk. When possible, use the /f switch instead of this switch. If you use the /t switch, you must also use the /n switch. These two switches provide an alternative method of specifying the size of the disk being formatted. You cannot use the /f switch with the /t switch.

/n:sectors

Specifies the number of sectors per track. When possible, use the /f switch instead of this switch. If you use the /n switch, you must also use the /t switch. These two switches provide an alternative method of specifying the size of the disk being formatted. You cannot use the /f switch with the /n switch.

/1

Formats a single side of a floppy disk.

/4

Formats a 5.25-inch, 360K, double-sided, double-density floppy disk on a 1.2-MB disk drive. Some 360K drives cannot reliably read disks formatted with this switch. When used with the /1 switch, this switch formats a 5.25-inch, 180K, single-sided floppy disk.

/8

Formats a 5.25-inch disk with 8 sectors per track. This switch formats a floppy disk to be compatible with MS-DOS versions prior to 2.0.

More Information About Format

ntcmds00000001.gif Format--Notes

ntcmds00000001.gif Format--Examples

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