[This is preliminary documentation and subject to change.]
NTFS version 5.0 and later support disk quotas, which allow administrators to control the amount of data that each user can store on an NTFS volume. Administrators can optionally configure the system to log an event when users are near their quota, and to deny further disk space to users who exceed their quota. Administrators can also generate reports and use the event monitor to track quota issues.
You can determine whether a file system supports disk quotas by calling the GetVolumeInformation function and examining the FILE_VOLUME_QUOTAS bit flag.
The following topics discuss disk quotas.