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// enter a GB value to check
let setgbvalue = 100;
// Query
Perf
| where TimeGenerated > ago(1h)
| where ObjectName == "LogicalDisk" and CounterName == "Free Megabytes"
| where InstanceName !contains "D:"
| where InstanceName !contains "_Total"
| extend FreeSpaceGB = CounterValue/1024
| summarize FreeSpace = min(FreeSpaceGB) by Computer, InstanceName
| where FreeSpace < setgbvalue
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