Using Disk Defragmenter in Visual C#.NET

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Using Disk Defragmenter
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The Disk Defragmenter utility improves performance by physically rearranging files so that they re stored in contiguous clusters. In addition to consolidating files and folders, the utility also consolidates free space, making it less likely that new files will be frag-
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Defragmenting Disks for Better Performance
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mented when you save them. The Disk Defragmenter process (Dfrgntfs.exe or Dfrgfat.exe, for disks in the NTFS and FAT32 formats, respectively) starts according to a schedule that you can adjust. To view the current settings, click the Disk Defragmenter shortcut (in the System Tools subfolder of the Accessories folder on the All Programs menu), or right-click any drive icon in the Computer window and click Defragment Now on the Tools tab. Figure 20-1 shows the simple Disk Defragmenter interface. The check box at the top of the dialog box allows you to enable or disable scheduled operation. The button at the bottom of the dialog box starts or stops manual defragmentation operation.
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Figure 20-1 Click the button at the bottom of this dialog box to begin defragmenting all local hard disks immediately. If Defragmenter is running, the button text reads Cancel Defragmentation.
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Click Modify Schedule to change when Disk Defragmenter runs automatically. By default, this option runs weekly, at 1:00 AM each Wednesday. You can schedule operation to be daily, weekly (you pick the day of the week), or monthly (you pick the date) and choose the time of day (round numbers only), as shown in Figure 20-2.
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Figure 20-2 Pick a daily, weekly, or monthly schedule for Disk Defragmenter to begin running as a background task. For details about managing scheduled tasks, see Using the Windows Vista Task Scheduler, 30 .
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INSIDE OUT
Do you need a more powerful defragmenter
Through every previous Windows version, Disk Defragmenter has been a bare-bones utility, sufficient for average users but frustratingly incomplete for power users . As a result, a thriving if specialized market in third-party disk utilities sprang up, led by Executive Software s Diskeeper utility (http://www.diskeeper.com), a full-featured version of (http://www.diskeeper.com), (http://www.diskeeper.com), the Defragmenter utility bundled with Windows XP . Symantec s Norton SystemWorks package (http://www.vista-io.com/2003) also includes a capable disk defragmenter, as (http://www.vista-io.com/2003) does Raxco s PerfectDisk (http://www.raxco.com) . Given the improvements in the Win(http://www.raxco.com) . (http://www.raxco.com) . dows Vista Disk Defragmenter, are these third-party tools still necessary At the time we wrote this, none of the mentioned third-party utilities was available in a Windows Vista-compatible version . If you have an older version written for Windows XP, we recommend you check reviews carefully before getting the upgrade .
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INSIDE OUT
Dedicate a partition for CD or DVD burning
The best way to avoid disk fragmentation is to start with a completely clean slate . If you routinely work with CD images, for instance, consider creating a separate partition that s big enough to temporarily hold the files you re working with . A 2-GB partition, for instance, is big enough to hold a CD image and all temporary files associated with it . (You ll need roughly 10 GB for a DVD-burning partition .) Keep that drive empty except when you plan to create a CD, at which time you can copy files to it for burning . Using this strategy, you can be certain that fragmentation won t have a deleterious impact on your CD-burning performance .
Running Disk Defragmenter from a Command Line
The command-line version of the Disk Defragmenter allows you to exercise fine-grained control over the defragmentation process and uses the exact same program code as the scheduled version. To use this command for a specific drive, type defrag d: at any command prompt, where d is the drive letter or mount point of an existing volume. (For an explanation of mount points, see Mapping a Volume to an NTFS Folder, 28.) You can use the following switches with the Defrag command:
-c Defragments all volumes on the computer; use this switch without specifying a specific drive letter or mount point. -a Analyzes the selected drive or volume and displays a summary of the analysis report. -r Performs a partial defragmentation by consolidating only file fragments that are below 64 MB in size. This is the default setting.
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