The Performance Monitor can be used as the source for a threshold
alarm. Here are some examples of frequently used threshold
monitors. For a complete listing and description of all default
object counters, see the Microsoft Windows documentation.
To monitor
select these options:
Object: LogicalDisk Counter: % Free Space Instance: 0/C:''
If the counter has a percent sign (%), it can be omitted if you
want to receive the raw value instead of a percent
For instances which have parent instances, a question mark (?)
can be used as a wildcard to match any parent instance. For
example: ?/C: matches 0/C and
1/C