DEFRAG

Reorganizes the files on a disk to optimize disk performance. Do not use this command when Windows 2 or 3.x is running.

note: Win9x no problems.

DEFRAG /?

DEFRAG [drive:] [/F] [/S[:]order] [/B] [/SKIPHIGH] [/LCD | /BW | /G0] [/H] [/V]

DEFRAG [drive:] [/U] [/B] [/SKIPHIGH] [/LCD | /BW | /G0] [/H] [/V]

DEFRAG [drive:] [/A] [/F] [/V]

drive: (v6.0 NTXP)

Specifies the drive that contains the disk you want to optimize.

/? (NTXP)

Display help.

/A (NTXP)

Analyzes the volume and displays a summary of the analysis report.

/B (v6.0)

Restarts your computer after files have been reorganized.

(NTXP)

UNDOCUMENTED. Pushes all commonly used programs and boot files to the edge of the hard drive for faster access.

/BW (v6.0)

Starts DEFRAG using a black and white color scheme.

/F (v6.0)

Defragments files and ensures that the disk contains no empty spaces between files.

(NTXP)

Forces defragmentation of the volume regardless of whether it needs to be defragmented.

/G0 (v6.0)

Disables the graphic mouse and graphic character set.

/H (v6.0)

Moves hidden files.

/LCD (v6.0)

Starts DEFRAG using an LCD color scheme.

/S (v6.0)

Controls how the files are sorted in their directories. If you omit this switch, DEFRAG uses the current order on the disk. The colon (:) is optional. The list describes each of the values you can use to sort files. Use any combination of the values, and do not separate these values with spaces.

• N In alphabetic order by name
• N- In reverse alphabetic order by name (Z through A)
• E In alphabetic order by extension
• E- In reverse alphabetic order by extension (Z through A)
• D By date and time, earliest first
• D- By date and time, latest first
• S By size, smallest first
• S- By size, largest first

/SKIPHIGH (v6.0)

Loads DEFRAG into conventional memory. By default, DEFRAG is loaded into upper memory, if upper memory is available.

/U (v6.0)

Defragments files and leaves empty spaces, if any, between files.

/V (v6.0)

UNDOCUMENTED. Verifies data as written to disk. This option slows the defragment.

(NTXP)

Displays the complete analysis and defragmentation reports.

When used in combination with /A, displays only the analysis report. When used alone, displays both the analysis and defragmentation reports.

none

• Disk information reported by DEFRAG and CHKDSK
• Network and INTERLNK drives
• Start DEFRAG only from DOS

You cannot use DEFRAG to optimize network drives or drives created with INTERLNK.

Disk information that DEFRAG reports differs from information that CHKDSK reports. DEFRAG reports hidden and user files as one number; CHKDSK reports numbers for each type. DEFRAG counts the root as a directory; CHKDSK does not. DEFRAG does not count the volume label as a file; CHKDSK does.

If you start DEFRAG from a program such as Microsoft Windows, you may lose data.

To load DEFRAG into conventional memory and specify that DEFRAG sort files according to the date they were created, from latest created to earliest created, type:

    DEFRAG C: /F /SD- /SKIPHIGH

This example fully optimizes drive C, but slows DEFRAG.

• 0 The defragmentation was successful
• 1 An internal error occurred
• 2 The disk contained no free clusters. To operate, DEFRAG needs 1 free cluster
• 3 The user pressed CTRL+C (^C) to stop the process
• 4 A general error occurred
• 5 DEFRAG encountered an error while reading a cluster
• 6 DEFRAG encountered an error while writing a cluster
• 7 An allocation error occurred. To correct the error, use SCANDISK
• 8 A memory error occurred
• 9 There was insufficient memory to defragment the disk

External

DOS

v6.0 v6.10 v6.2 v6.21 v6.22 v6.23

Windows

none

Windows NT

NTXP NT2003