2003 SBS Server Monitoring Reports and alerts gives a critical error Low Disk Space (HarddiskVolume19)

First of all there is no HarddiskVolume19.  This has been cycling for about two weeks.  It started at 6.

Here is the detail  of the Critical Error:
The following disk is low on free disk space. Low levels of free disk space can cause performance problems and prevent users from saving files on the disk.

Drive Letter: HarddiskVolume19
Free Disk Space: 0.000000. MB
% Free Disk Space: 0.000000.%

You can disable this alert or change its threshold by using the Change Alert Notifications task in the Server Management Monitoring and Reporting taskpad.

We would rather not disable low disk Space in the Alert Notifications if possible.
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
Reboot the server.

TYPICALLY, I've seen this happen when an external drive (USB drive, flash drive, even a memory card from a card reader) is removed improperly.  A reboot has always resolved it for me.
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