Have you looked through the older posts here? Cool Uses for Perl and Code Catacombs often have some really great places to start, especially for older systems.
For instance (code) Win32 disk monitor, email notify, event log and Domain Disk space check both sound like they would give you what you're asking for here.

In reply to Re: get disk usage details like free, used, available for windows drives with sizes in TB by RyuMaou
in thread get disk usage details like free, used, available for windows drives with sizes in TB by balakrishnan

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