NTFS Disk Quotas
NTFS disk quotas track and control disk usage on a per-user, per-drive (partition or volume) basis. You can apply disk quotas only to NTFS formatted drives under Windows Server 2003, Windows XP Professional and Windows 2000. Quotas are tracked for each drive letter, even if drive letters reside on the same physical disk.
The per-user feature enables you to track every user's disk space usage regardless of which folder the user stores files in. Disk quotas do not take compression into account, so users cannot obtain more space simply by compressing their data.
To enable disk quotas, open Windows Explorer or My Computer, right-click a drive letter and select properties, click the Quota tab, and configure the options as shown below:
After you turn on the disk quota system, you can establish individual disk quota limits for each user by clicking the Quota Entries button at the bottom of the Quota tab. By default, only members of the Administrators group can view and change quota entries and settings. In addition, all members of the Administrators group inherit unlimited disk quotas by default.
NTFS disk quotas are based on file ownership, so operating system accounts are not immune to disk quotas. System accounts such as the local system are also susceptible to running out of disk space due to disk quotas having been set.
From the Quota Entries window (see below), you can change an existing quota entry for a user by double-clicking it. To set up a new quota entry for a user, click the Quota menu and select the New Quota Entry option. When a user no longer stores data on a volume, you should delete the user's disk-quota entries. The catch is that you can only delete the user's quota entries after you remove all the files that the user owns or after another user takes ownership of the files.
Next: NTFS Data Compression