Get-WinREPartitionInfo.psm1

function Get-WinREPartitionInfo {
    [CmdletBinding()]
    param()

    if ( $false -eq (New-Object System.Security.Principal.WindowsPrincipal([System.Security.Principal.WindowsIdentity]::GetCurrent())).IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator) ) {
        Write-Warning "Please run this as an administrator."
        return
    }

    #region REAGENTC.EXE to PSCustomObject
    $OutputObject = [ordered]@{}
    (& "$($env:windir)\system32\reagentc.exe" /info) | Select-String -SimpleMatch ':' | Where-Object { $_ -notmatch '^Information:|^REAGENTC.EXE' } | ForEach-Object {
        $ArrayLine = $_.Line -split ':' | ForEach-Object { (Get-Culture).TextInfo.ToTitleCase($_) }
        $OutputObject += @{
            "$( (Get-Culture).TextInfo.ToTitleCase($ArrayLine[0].Trim()).Replace(' ','') -replace '\(BCD\)','' )" = $ArrayLine[1].Trim().Replace(' ','')
        }
    }
    $OutputObject = [PSCustomObject]$OutputObject
    $OutputObject | Add-Member -MemberType ScriptProperty -Name DiskNumber -Value { [int]([regex]::Match($this.WindowsRELocation, '\\Harddisk(?<DiskNumber>.+?(?=\\))').Groups['DiskNumber'].Value) }
    $OutputObject | Add-Member -MemberType ScriptProperty -Name PartitionNumber -Value { [int]([regex]::Match($OutputObject.WindowsRELocation, '\\Partition(?<PartitionNumber>.+?(?=\\))').Groups['PartitionNumber'].Value) }
    #endregion

    $OutputObject | Add-Member -MemberType NoteProperty -Name SharedSystemDisk -Value $null
    $OutputObject | Add-Member -MemberType NoteProperty -Name SharedSystemPartition -Value $null
    $OutputObject | Add-Member -MemberType NoteProperty -Name WindowsREPartitionBeforeSystemPartition -Value $null
    $OutputObject | Add-Member -MemberType NoteProperty -Name WindowsREPartitionAfterSystemPartition -Value $null
    $OutputObject | Add-Member -MemberType NoteProperty -Name SizeMB -Value $null
    $OutputObject | Add-Member -MemberType NoteProperty -Name FreeSpaceMB -Value $null

    if ( $OutputObject.WindowsREStatus -eq 'Enabled' ) {
        $SystemDriveLetter = $env:SystemDrive -replace ':',''
        $SystemPartition = Get-Partition -DriveLetter $SystemDriveLetter
        Write-Verbose "SystemDiskNumber: $($SystemPartition.DiskNumber)"
        Write-Verbose "SystemPartitionNumber: $($SystemPartition.PartitionNumber)"
        Write-Verbose "SystemAccessPath: $( $SystemPartition.AccessPaths | Where-Object { $_ -match '\\Volume\{' } )"

        Write-Verbose "WindowsRELocation: $($OutputObject.WindowsRELocation)"
        Write-Verbose "WindowsREDiskNumber: $($OutputObject.DiskNumber)"
        Write-Verbose "WindowsREPartitionNumber: $($OutputObject.PartitionNumber)"
        $WindowsREPartition = Get-Partition -DiskNumber $OutputObject.DiskNumber -PartitionNumber $OutputObject.PartitionNumber
        $OutputObject.SizeMB = [math]::Round($WindowsREPartition.Size / 1MB)

        $WindowsREAccessPath = $WindowsREPartition.AccessPaths[0]
        Write-Verbose "WindowsREAccessPath: $($WindowsREAccessPath)"
        $OutputObject.FreeSpaceMB = [math]::Round((Get-WmiObject Win32_Volume | Where-Object { $_.DeviceId -eq $WindowsREAccessPath }).FreeSpace / 1MB)

        $OutputObject.SharedSystemDisk = $SystemPartition.DiskNumber -eq $WindowsREPartition.DiskNumber
        $OutputObject.SharedSystemPartition = $OutputObject.SharedSystemDisk -eq $true -and $SystemPartition.PartitionNumber -eq $WindowsREPartition.PartitionNumber
        $OutputObject.WindowsREPartitionBeforeSystemPartition = $SystemPartition.DiskNumber -eq $WindowsREPartition.DiskNumber -and $WindowsREPartition.PartitionNumber -lt $SystemPartition.PartitionNumber
        $OutputObject.WindowsREPartitionAfterSystemPartition = $SystemPartition.DiskNumber -eq $WindowsREPartition.DiskNumber -and $WindowsREPartition.PartitionNumber -gt $SystemPartition.PartitionNumber
    }

    Write-Host
    switch ($true) {
        ( $OutputObject.WindowsREStatus -ne 'Enabled' ) {
            Write-Warning "The recovery partition disabled."
            return
        }
        ( $OutputObject.WindowsREPartitionBeforeSystemPartition ) {
            Write-Warning "The recovery partition is before system partition. Recovery partition upgrades may require more space than is currently available on the partition. Additional actions would be required if this occurs."
            break
        }
        ( $OutputObject.WindowsREPartitionAfterSystemPartition ) {
            Write-host "The recovery partition is after system partition." -ForegroundColor Green
            break
        }
        ( $OutputObject.SharedSystemPartition ) {
            Write-host "The recovery partition is shared with the system partition." -ForegroundColor Green
            break
        }
        default {
            Write-Host "Unexpected result." -ForegroundColor Red
        }
    }

    $OutputObject
}