# Getting Disk Signature
Get-Disk | ft FriendlyName, Signature
 
# Add Disk Signatures into Array
$Signatures = "4D53465420202020E55D0891031DB04CB1F2B507ED9FDC88","4D53465420202020E55D0891031DB04CB1F2B507ED9FDC89"
 
# Making Them Online
foreach ($Signature in $Signatures)
{
	Get-Disk | Where {$_.Signature -eq $Signature} | Set-Disk -IsOffline $False
}
 
# Making Them Offline
foreach ($Signature in $Signatures)
{
	Get-Disk | Where {$_.Signature -eq $Signature} | Set-Disk -IsOffline $True
}