#check if powershell is in admin mode or attempt to swith to admin mode
if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) { Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs; exit }

#If condition to check for Regsitry key exists
if(Test-Path 'HKLM:\SYSTEM\HDD'){
#create variables to store disk info and counter
$var1 = @(Get-PhysicalDisk | Select FriendlyName, MediaType)
$var2 = 0

#count number of rows of disk data
$var1a = $var1.getenumerator()

while ($var1a.MoveNext()) {
# Create Registry values
Set-ItemProperty HKLM:\SYSTEM\HDD -Name $var2 -Value $var1a.current -Type multistring
$var2 = $var2+1

}
} else {
New-Item -Path HKLM:\SYSTEM\HDD
$var1 = @(Get-PhysicalDisk | Select FriendlyName, MediaType)
$var2 = 0

$var1a = $var1.getenumerator()

while ($var1a.MoveNext()) {

Set-ItemProperty HKLM:\SYSTEM\HDD -Name $var2 -Value $var1a.current -Type multistring
$var2 = $var2+1

}
}