Splunk Search for Windows Free Disk Space by Drive Copy
(index=windows OR index=perfmon OR index=os) sourcetype=perfmonMK:LogicalDisk instance!=_Total instance!=Harddisk* | eval FreePct-Other=case( match (instance, "C:"), null(), match(instance,"D:"), null(),true(),storage_free_percent), FreeMB-Other=case( match (instance, "C:"), null(), match(instance,"D:"), null(), true(),Free_Megabytes), FreePct-{instance}=storage_free_percent,FreeMB-{instance}=Free_Megabytes
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