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Both tools can defragment NTFS volumes that have cluster sizes larger than 4 KB and files smaller than 16 clusters.
Both tools can also defragment the master file table (MFT) on NTFS volumes.
If you use the /f or /r parameter on a large volume (for example, 70 GB) or on a volume with a very large number of files (in the millions), Chkdsk can take a long time to complete.
The volume is not available during this time because Chkdsk does not relinquish control until it is done.
Windows XP Professional offers two choices for defragmenting disks: the Disk Defragmenter snap-in and a new command-line version of the tool (Defrag.exe).
For more information about minimizing downtime during Chkdsk, see “Reducing the Time Required to Run Chkdsk on NTFS Volumes” later in this chapter.
When you use the /f or /r parameters to run Chkdsk on the boot volume, Chkdsk displays the following message: Note: Some of the lines in the following code have been displayed on multiple lines for better readability.
At any time, you can manually run Chkdsk at the command prompt or from Windows Explorer or My Computer.
For more information about running the graphical version of Chkdsk, see “Running Chkdsk from My Computer or Windows Explorer” later in this chapter.
If you press the Y key, a version of Chkdsk known as Autochk runs the next time the computer restarts.