How to Use Hard Links in Visual C#

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How to Use Hard Links
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Hard links create a second directory entry for a single file, whereas symbolic links create a new file that references an existing file . This subtle difference yields significantly different behavior . You can create hard links by adding the /H parameter to the mklink command . For example, the following command creates a hard link from Link .t xt to Target .t xt .
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C:\>mklink /H link.txt target.txt Hardlink created for link.txt <<===>> target.txt
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As with symbolic links, any changes made to the hard link are made automatically to the target (including attribute changes) and vice versa because the file itself is stored only once on the volume . However, hard links have several key differences:
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Hard links must refer to files on the same volume, while symbolic links can refer to files or folders on different volumes or shared folders . Hard links can refer only to files, while symbolic links can refer to either files or folders . Windows maintains hard links, so the link and the target remain accessible even if you move one of them to a different folder . Hard links survive deleting the target file . A target file is deleted only if the target file and all hard links are deleted . If you delete a symbolic link target and then create a new file with the same name as the target, the symbolic link will open the new target . Hard links will continue to reference the original target file, even if you replace the target . Hard links do not show up as symbolic links in dir command-line output, and Windows Explorer does not show a shortcut symbol for them . Hard links are indistinguishable from the original file . Changes made to file permissions on a hard link apply to the target file and vice versa . With symbolic links, you can configure separate permissions on the symbolic link, but the permissions are ignored .
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Windows XP supports hard links by using the fsutil hardlink command . Windows Vista and Windows 7 hard links are compatible with Windows XP hard links, and the fsutil hardlink command continues to function in Windows Vista and Windows 7 .
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Disk Quotas
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Administrators can configure disk quotas to control how much of a volume a single user can fill with files . This is most useful when implemented on a server that hosts shared folders . However, you might also need to implement disk quotas on client computers in environments in which multiple users access a single computer because they can help prevent a single user from completely filling a volume and thereby preventing other users from saving files . Disk quotas have not changed significantly since Windows XP . Before enabling disk quotas, consider whether they are worthwhile . Managing disk quotas requires administrators to monitor disk quota events, such as a user exceeding a disk storage threshold . Administrators must then work with users to either increase the quota or identify files that can be removed . Often, it is less expensive to simply add more disk storage, even if the users do not closely manage their disk usage .
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How to Configure Disk Quotas on a Single Computer
To configure disk quotas on a single computer, follow these steps:
1. 2. 3. 4.
Click Start and then click Computer . In the right pane, right-click the drive on which you want to configure the quotas and then click Properties . Click the Quota tab and then click Show Quota Settings . The Quota Settings dialog box appears . Select the Enable Quota Management check box, as shown in Figure 16-20 .
FIgURE 16-20 Disk quotas control how much of a disk users can fill .
CHapTER 16
Managing Disks and File Systems
From this dialog box, you can configure the following disk quota options:
Enable Quota Management Quota management is disabled by default . Select this check box to enable quota management . Deny Disk Space To Users Exceeding Quota limit By default, users are warned only if they exceed their quota limits . Selecting this check box causes Windows to block disk access after the quota is exceeded . Typically, warning users is sufficient, provided that you also log the events and follow up with users who do not clean up their disk space . Denying disk access will cause applications to fail when they attempt to write more data to the disk and can cause users to lose unsaved work .
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