File Management in .NET

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File Management
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comments and a maximum number of simultaneous users to be con gured for the share
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5 FILE SYSTEM AND PRINT MANAGEMENT FEATURES
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The basic Share option and the Advanced Sharing option
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The File Sharing dialog is an easy interface to control access to shares
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File System and Print Management Features
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NOTE The whole issue of share permissions is interesting In many environments, shares are not used to govern access because the les and folders already have NTFS permissions I prefer to set shares so that domain users have full control and then use NTFS permissions to restrict actual levels of access to the data
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To create a share from the command line, use the following format:
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net share <share name>=<drive>:<dir> /remark= <description> net share john=c:\data\johndrv /remark= Johns drive
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NTFS Quotas
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Since Windows 2000, disk quotas have been available through the NTFS le system This simplistic quota capability allowed only an amount of logical disk space for individual users for an entire disk The NTFS quota facility has no capability for a shared quota for groups of users nor does it base the quota on a subfolder of the disk In most instances, the le server resource management s quota component should be used, which is explored later in the File Server Resource Manager section Let s now look at the basic quota component of NTFS To enable quotas on a disk, right-click the disk and select its Quota tab By default, quotas are disabled Click the Enable Quota Management option and the Apply button to gain access to the other quota con gurable options, as shown in Figure 5-16 A default quota amount and a warning level can be speci ed for all users of the disk If the Deny Disk Space to Users Exceeding Quota Limit is selected, the user cannot write any more data after the quota is reached As shown in Figure 5-16, options are available to log events when users reach the quota limit or warning levels These default values apply to all users of the disk However, if you select the Quota Entries button, specific quotas for individual users can be set Any user that owns les on the disk is displayed, along with the amount of disk space he is using and how much of his total quota the used space equates to If you right-click on a user and select Properties, the individual quota settings can be con gured, as shown in Figure 5-17 You can also create quota entries for people who are not yet using space on the drive by selecting New Quota Entry from the Quota menu, selecting their AD account, and setting quota limits for them
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5 FILE SYSTEM AND PRINT MANAGEMENT FEATURES
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The quota allows disk space usage to be limited to a certain prede ned
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This shows how individual quota entries beyond the generic setting can be set
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You might have invested a lot of time setting up speci c quotas for each user To move quotas from one disk to another, export them and then import them To export quotas from a volume, perform the following: 1 Start Explorer 2 Right-click on the volume that has the quotas you want to copy and select Properties 3 Select the Quota tab 4 Click the Quota Entries button 5 From the Quota menu, select the Export option 6 Enter a lename for the export le and click Save 7 Close the Quota dialog To import the freshly exported quota information, perform the same tasks, substituting export with import: 1 Start Explorer 2 Right-click on the volume that will import the quotas and select Properties 3 Select the Quota tab 4 Click the Quota Entries button 5 From the Quota menu, select the Import option 6 Select the exported le and click Open 7 For any quotas that already exist, you are asked if you want to replace them and if this action should be performed on all clashes Click OK 8 Close the Quota dialog Again, while this type of quota system does exist, the File Server Resource Manager (FSRM) version is far superior and allows granular quotas with a wide range of actions to be performed if a quota is reached
Encrypted File System (EFS)
NTFS is a secure le system However, an increasing number of people are using portables and utilities such as NTFSDos that bypasses NTFS security Another layer of protection is needed for these more mobile environments The Encrypted File System (EFS) was new for Windows 2000 and the NTFS 5-0 le system EFS uses public and private key encryption and the CryptoAPI architecture EFS can use any symmetric encryption algorithm to encrypt data and includes support for Microsoft Enhanced and Strong cryptographic service providers