Script to check if PC has an SSD and assign disk to variable for later use

Question

I'm trying to create a PowerShell script to check if any of the computer's disks is an SSD and then pass that disk number as a variable to other scripts, which will use it to select which disk a Windows image will be installed to. Also, the SSD must be larger than a certain size, otherwise the script may select my UFD boot media. I'm still new to scripting in PS, so I'm having difficulty getting this to work (though I think I'm on the right track). Note that this script needs to run in PowerShell within WinPE.

Here's my pseudo code script:

$disks = Get-PhysicalDisk | Select DeviceID, MediaType, Size

If number of disks > 1 Then
  For Each disk
    If MediaType = SSD AND Size > 100GB Then
      $mainDisk = DeviceID
      Exit Loop
    Else
    End If
  Next disk
Else
End If
If $mainDisk is $null Then
  $mainDisk = disk 0
Else
End If

Pass $mainDisk to script for disk config/Windows install

(Please excuse the lack of proper PS syntax as I figure it would be easier to understand this way due to my limited familiarity with PS syntax)

The key here is the Get-PhysicalDisk Cmdlet. I think a big part of my problem is that the $disks variable is created as a PSCustomObject as opposed to a Hashtable and I can't seem to get the rest of my script to work with it.
If anyone has a better approach, I'd love to hear it.
Any help would be greatly appreciated. Thanks in advance.

Answer 1

How about this?

$MainDisk = 0
ForEach ($disk in (Get-PhysicalDisk | Select-Object DeviceID, MediaType, Size)){
    If ($disk.MediaType -eq 'SSD' -and $disk.Size -gt 100GB){
        $MainDisk = $disk.DeviceID
        break
    }
}