Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

◄Example►  ◄Syntax►
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                               DEFRAG──Notes
 
Network and INTERLNK drives
 
You cannot use DEFRAG to optimize network drives or drives created with
INTERLNK.
 
Disk information reported by DEFRAG and CHKDSK
 
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.
 
Start DEFRAG only from MS-DOS
 
If you start DEFRAG from a program such as Microsoft Windows, you may lose
data.
 
DEFRAG exit codes
 
The following list briefly describes the meaning of each DEFRAG exit code
(ERRORLEVEL parameter):
 
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 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 the <SCANDISK>
    command.
 
8
    A memory error occurred.
 
9
    There was insufficient memory to defragment the disk.
 
You can use the ERRORLEVEL parameter on the IF command line in a batch
program to process exit codes returned by DEFRAG. For an example of a batch
program that processes exit codes, see the <CHOICE> command.
 
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