For quota enforcement to work, the quota minifilter driver must be loaded. If the quota minifilter driver is experiencing problems, quota scans might fail, and the updated quota usage information of volumes and folders will not be available. If the driver cannot attach to the volume, quotas cannot be enforced on that volume.
This issue is rare. It most commonly happens on a computer that is experiencing a heavy load and runs out of memory (RAM).
Load and start the driver
A member of the Administrators group must manually load the quota minifilter driver and then start the driver. If these procedures do not work, the administrator should reboot the computer.
To load the quota minifilter driver to the volume:
1. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
2. At the command prompt, type:
fltmc attach quota <volume>:
Where volume is the drive letter of the volume. For example:
fltmc attach quota c:
To start the quota driver:
2. At a command prompt, type:
net start quota
To verify that the quota driver is attached and running, review the output of the net start command.