Starting with this: Get-PSDrive -PSProvider FileSystem (Running on a system with mapped drives)

If I run this it excludes lines missing data: Get-PSDrive -PSProvider FileSystem | Where-Object {$_.Used -ne 0}

But if I run this it doesn't: Get-PSDrive -PSProvider FileSystem | Where-Object {$_.Used -ne $null}

This has got to be a simple questions but it's details like this that stop me from understanding what public scripts are doing and getting better at creating my own. Why does an empty/blank value -eq 0 ??

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UPDATE for posterity. I found an Interesting quirk. (Or I wonder if this is the root of the broken code u/ka-splam referred to?)

So just running the following line I get blanks for 'Used' and 'Free' for mapped drives.Get-PSDrive -PSProvider FileSystem

But if I run this line, I get '0' s for 'Used' and blanks (nulls) for 'Free', verified with the isnullorempty testGet-PSDrive -PSProvider FileSystem | Select-Object -Property * | Format-Table